KNIME Server Administration Guide

For a list that includes the new Analytics Platform 4.1 features see here.

Highlighted new functionality is:

A detailed changelog for KNIME Server 4.10 is also available.

Since KNIME Server 4.10 it is possible to configure workflows before execution. Starting with KNIME Server 4.10.1 these configurations are encrypted using the secret key defined in

While the behavior remains the same as for KNIME Server 4.10 and is backward compatible, downgrading from KNIME Server 4.10.1 to a previous version will result in losing job and scheduled job information and thus is not recommended. This information will also be lost in case the secret key changes.

The following new options are available in the knime-server.config. Full details can be found at KNIME Server configuration file options.

In previous releases, the KNIME Server executor was rotated once a day by default. This means that after 24 hours, an executor would not accept any new jobs, after which a new executor starts up and takes its place. After a transitional period, the old executor was retired.

This overlap during the transitional period comes with a few undesired side effects, most notably a lack of efficiency when it comes to resource usage. For this reason, we decided to deactivate this function by default. By doing so, there is no need to factor in an additional executor when allocating available memory.

Note that we did not remove the rotation functionality, but instead only deactivated it by default. If needed, you can still activate it by adjusting the parameter com.knime.server.executor.max_lifetime in knime-server.config.

Controlling the available update sites via Server Managed Customizations has been extended. It’s now possible to add multiple update sites and also disable the default update sites.

The options for adding a single update site have been deprecated and will be removed in the future. You can easily adjust your templates by simply adding an "s" to the property names (updateSite.uri to updateSite.uris and updateSite.name to updateSite.names). See Client customization for details.

Controlling the available update sites via Server Managed Customizations has been extended. It’s now possible to add multiple update sites and also disable the default update sites.

The options for adding a single update site have been deprecated and will be removed in the future. You can easily adjust your templates by simply adding an "s" to the property names (updateSite.uri to updateSite.uris and updateSite.name to updateSite.names). See Client customization for details.

Several KNIME nodes have been revised to use a new shared framework for file access (see below for a list of nodes). When executing on KNIME Server, a new preference controls whether those nodes can access the local file system of the KNIME Server Executor or not. Currently local file system access is allowed by default, however the default will change with the next release (KNIME Server 4.11).

To disallow local file system access, add the following line to the preferences.epf or customization profile used by your KNIME Server Executor(s):

This preference currently only affects the following KNIME nodes: Excel Reader (XLS), Excel Writer (XLS), Excel Sheet Appender (XLS), Line Reader. More nodes will follow over the next releases.

KNIME Server is configured by a knime-specific configuration file named knime-server.config. The file can be found in <server-repository>/config/knime-server.config. Most of the parameters defined in this file can be changed at runtime and will take effect as soon as possible. Default values will be used for empty or missing configuration options.

The section KNIME Server configuration file options contains a comprehensive list of all configuration options and explanations.

You might want to prevent the usage of certain nodes on the executor of KNIME Server. While you can decide, which extensions you install for the executor there might be nodes in the basic installation of KNIME Analytics Platform or in a required extension that shouldn’t be used.

The configuration option

allows you to define a list of nodes that should be blocked by the executor. This list also supports wildcards (*). If a workflow contains a blacklisted node the executor will throw an error and abort loading the workflow.

To blacklist a node you have to provide the full name of the node factory. The easiest way to determine the factory names of the nodes you want to block is to create a workflow with all nodes that should be blacklisted. After saving the workflow you are able to access the settings.xml of each node under <knime-workspace>/<workflow>/<node>/settings.xml. The factory name can be found in the entry with key "factory".

The following shows an example on how to block the Java Snippet nodes. The factory information for the Java Snippet node is

To block the Java Snippet node we simply provide the value (without the quotes)

The factory names for Java Snippet (simple), Java Snippet Row Splitter, and Java Snippet Row Filter are

Since they all share the same prefix, we append n factory name making use of wildcards:

While users are still able to upload workflows containing these nodes, the executor won’t load a workflow containing any of them.

If the KNIME Executor requires certain preferences (e.g. database drivers), you need to provide a preference file to the server that is read by every started KNIME Executor.

Note: Make sure to specify the paths of all database drivers in the new preference page, in order to be able to execute workflows with database nodes. The page is available in the "KNIME" → "Database Drivers" category of the preferences.

You might want to tweak certain settings of this KNIME instance, e.g. the amount of available memory or set system properties that are required by some extensions. This can be changed directly in the knime.ini in the KNIME executor installation folder.

KNIME Server will read the knime.ini file next to the KNIME executable and create a custom ini file for every executor that is started. However, if you use a shell script that prepares an environment the server may not be able to find the ini file if this start script is in a different folder. In this case the knime.ini file must be copied to <server-repository>/config/knime.ini. If this file exists, the server will read it instead of searching for a knime.ini next to the executable or start script.

There are several log files that could be inspected in case of unexpected behavior:

The email configuration is defined in the web application context configuration file which is <tomee-folder>/conf/Catalina/localhost/knime.xml (or com.knime.enterprise.server.xml or similar). The installer has already created this file. In order to change the email configuration, you have to modify or add attributes of/to the <Resource name="mail/knime" …​ /> element. All configuration settings must be added as attributes to this element. The table below shows the list of supported parameters (see also the JavaMail API documentation). Note that the mail resource’s name must be mail/knime and cannot be changed.

If you do not intend to use the email notification service (available in the KNIME WebPortal for finished workflow jobs), you can skip this step.

Note that the mail configuration file contains the password in plain text. Therefore, you should make sure that the file has restrictive permissions.

LDAP authentication is the recommended authentication in any case where an LDAP server is available. If you are familiar with your LDAP configuration you can add the details during installation time, or edit the server.xml file post installation. If you are unfamiliar with your LDAP settings, you may need to contact your LDAP administrator, or use the configuration details for any other Tomcat based system in your organization. Please refer to the KNIME Server Advanced Setup Guide for details on setting up LDAP.

KNIME Server also allows authentication by JWT (JSON Web Tokens) that have previously been issued by the server. The REST endpoint /rest/auth/jwt can be used to acquire such a JWT for the currently logged in user. Subsequent requests need to carry the token in the Authorization header as follows:

where xxx.yyy.zzz is the JWT. Token-based authentication is enabled by default and cannot be disabled. However, you can restrict the maximum lifetime of JWTs issued by the server via the server configuration option com.knime.server.login.jwt-lifetime, see section KNIME Server configuration file options.

The OpenAPI documentation for the REST API which can be found at: https://<hostname>/knime/rest/doc/index.html#/Session should be considered the definitive documentation for this feature.

Database-based authentication is recommended to be used by small workgroups who do not have access to an LDAP system, or larger organisations in the process of trialing KNIME Server. If using the previously described H2 database it is possible to use the AdminPortal to manage users and groups. It is possible to use other SQL databases e.g. PostgreSQL to store user/group information, although in this case it is not possible to use the AdminPortal to manage users/groups, management must be done in the database directly.

For default installations this authentication method is enabled within the server.xml file. No configuration changes are required. In order to add/remove users, or create/remove groups the administration pages of the WebPortal can be used. The administration pages can be located by logging into the WebPortal as the admin user, see section Administration pages for more details.

Batch insert/update of usernames and roles is possible using the admin functionality of the KNIME Server REST API. This is described in more detail in the section RESTful webservice interface. A KNIME Workflow is available in the distributed KNIME Server installation package that can perform this functionality.

For KNIME Server versions 4.3 or older the default configuration used a file-based authentication which we describe for legacy purposes. It is now recommended to use either database-based or LDAP authentication. The advantages of each are described in the corresponding sections above and below.

The XML file <tomee-folder>/conf/tomcat-users.xml contains examples on how to define users and groups (roles). Edit this file and follow the descriptions. By default this user configuration file contains the passwords in plain text. Encrypted storage of passwords is described in the Tomcat documentation.

The easiest way to install additional extensions into the executor (e.g. Community Extensions or commercial 3^rd party extensions) is to start the executor in GUI mode and install the extensions as usual. In case you don’t have graphical access to the server you can also install additional extensions without a GUI. The standard knime executable can be started with a different application that allows changing the installation itself:

Adjust the following parameters to your needs:

Update of an existing installation can be performed by using the update-rmi.sh script in the root of the installation. You only have to provide a list of update sites that contain the new versions of the installed extensions and all installed extension will be updated (given that an update is available):

If you want to selectively update only certain extensions, you have to build the update command yourself. An update is performed by uninstalling (-u) and installing (-i) an extension at the same time:

To update the Big Data Extensions, for example, run the following command:

Once you have installed the KNIME Executor with all necessary extensions, you have to tell the server where to find the executor. Set the value of com.knime.server.executor.knime_exe in the server configuration to the knime executable. The path can be absolute or relative to the server’s configuration folder (<server-repository>/config). The path to the executor can be changed while the server is running it will be used when a new executor should be started (e.g. when the first workflow is being loaded).

For Windows users: For paths in the server configuration file either use forward slashes ("/") or double backslashes ("\\"). A single backslash is used to escape characters.

Sometimes workflow jobs running in the executor want to access files on the server, e.g. via workflow-relative URLs or by a URL using the server’s mount point ID. Since the executor cannot authenticate itself to the server with the user’s password (because it’s generally not known by neither the server nor the executor) a token is generated by the server, when the workflow is started (or scheduled). This token represents the user including his group membership at the time it is created. If group membership changes while the workflow job is still running or there are further scheduled executions, these changes will not be reflected in the workflow execution. Also if access has been revoked from the user completely, existing (scheduled) jobs can still access the server repository.

If the executor is running on a different computer than the server, please pay attention to the following: The communication between server and executor is partially performed via the REST interface, e.g. when a workflow requests files from the server repository. Therefore the executor must know the server’s address. The server tries to auto-detect its address and sends it to the executor. However, if the server is running behind a proxy (e.g. Apache) or has a different external IP address than internally, auto-detection will give a wrong address and the executor will not be able to reach the server. In this case you have to set the configuration option com.knime.server.canonical-address to the server’s canonical address, e.g. http://knime-server.behind.proxy/ (you do not need to provide the path to the server application). This address must be usable by the executor.

If you install KNIME Server on a Linux or macOS operating system, you can configure KNIME Server to either use a single, global executor or multiple user specific executors to run your workflows. For Windows based installations, only the global execution mode is supported.

Running with multiple executors complicates the installation process and can be much less efficient depending on your degree of concurrent access to the server since each executor has some computational overhead to maintain it. In order to mitigate this effect, you can limit the number of concurrent KNIME instances. Be aware that this will block users from executing workflows if the maximum is exceeded until a user frees his instance. Additionally, there is a preference in KNIME which can limit the number of threads used per executor.

The benefit of using multiple executors is that the workflows from different users run in relative isolation from one another; they don’t share memory and should one executor become unresponsive, this should not directly affect the workflows running in the other executors. Additionally, in this case each executor is run by its user, which may be useful if your users will want to access resources on the system which are external to KNIME but are available to them at the user level. Finally, if you have KNIME Cluster Execution installed at the server and if you are using multiple executors, users will submit jobs to the cluster as themselves rather than a generic user.

By default the servers uses one KNIME Executor for all workflow jobs. On Linux systems KNIME Server offers the option to create a separate, KNIME executor instance for each user. To use multiple KNIME Executors, the following configuration is recommended:

As part of a highly available architecture, KNIME Server 4.10 allows you to distribute execution of workflows over several executors that can sit on separate hardware resources. This allows KNIME Server to scale workflow execution with increasing load because it is no longer bound to a single computer. KNIME Server 4.10 implements the full functionality of the RMI executors.

If you’re planning to use the distributed executors in production environments please get in touch with us directly, for more information.

Installation, configuration, and operation is very similar to the single executor setup. The server communicates with the executors via a message queueing system (and HTTP(S)). We use RabbitMQ for this purpose, and it’s recommended, although not required, to install that on a separate machine as part of a highly available architecture.

Enabling distributed executors consists of the following steps:

In case the connection to the message queue gets lost (e.g. by restarting RabbitMQ), starting with KNIME Server 4.11 the executor will try to reconnect to the message queue. The following option can be adjusted in the knime.ini file of the executor:

In order to enable a job pool, a property has to be set on the workflow that should be pooled. Setting workflow properties can be done in the KNIME Explorer (starting with KNIME Server 4.9.0) by right-clicking on a workflow and selecting 'Properties…​'. A dialog will open that lets the user view and edit the properties of the workflow.

Otherwise, workflow properties can also be set via a REST call, e.g. using curl:

This will enable a pool with at most pool-size jobs for the workflow workflow.

It is only possible for single-call executions that do loading, execution, and discard in one call (i.e. the current :execution resource). Jobs that clients execute with multiple REST calls (load, execute, re-execute, discard) cannot be pooled.

Job pools can be disabled by setting the job pool size to 0, either in the KNIME Explorer or via a REST call:

In order to make use of the pooled jobs, a special REST resource has to be called for executing a job. Instead of calling out to :execution you have to call to :job-pool. Apart from that both calls are identical concerning semantics and allowed parameters.

Executing a pooled job might look as follows:

This will call workflow passing v1 for input parameter p1 and v2 for input parameter p2. Calls using POST will work in a similar way using the :job-pool resource.

Job pools exhibit a certain behaviour which is slightly different from executing a non-pooled job. Clients should be aware of those differences.

In order to use workflow pinning, the KNIME Server Distributed Executors must be enabled and RabbitMQ must be installed. Otherwise, the set executor requirements are ignored.

Executor requirements for a workflow can be defined by setting a property on the workflow. The executor requirements are a simple comma-seperated list of user-defined values. Setting workflow properties can be done in the KNIME Explorer by right-clicking on a workflow and selecting 'Properties…​'. A dialog will open that lets the user view and edit the properties of a workflow.

Alternatively, workflow properties can also be set via a REST call, e.g. using curl:

This will set the executor requirements executor-requirements for the workflow workflow.

To define which resources an executor can provide, a property has to be set for the executors. This can be done in two ways:

Executor requirements can be removed by setting the property to an empty field. This can be done either in the KNIME Explorer or via a REST call:

The property can be removed either by completely removing the environment variable or by completely removing the property in the knime.ini file depending on the way the property was set. Alternatively, the property can also be removed by leaving the value of the environment variable or the value of the property in the knime.ini file empty.

An executor only accepts a job if it can fulfill all the executor requirements that were defined for the workflow. Otherwise, it will just ignore the job.

The KNIME Remote Workflow Editor enables users to investigate the status of jobs on the server. Whenever a workflow is executed on the KNIME Server, it is represented as a job on the server. This instance of your workflow will be executed on the KNIME Server, which can be helpful in cases where the server hardware is more powerful than your local hardware, the network connection to external resources such as databases is faster, and does not require traversing firewalls/proxies.

The Remote Workflow Editor looks just like your local workflow editor, apart from the fact that it is labelled and the canvas has a watermark to help identify that the workflow is running on the KNIME Server.

Most of the edit functionality that you would expect from editing a workflow locally on your machine is possible. Notable cases where it’s not yet supported are: copying nodes from a local workflow to a remote workflow (and vice-versa), browse dialog for file reader/writer nodes browses the local filesystem rather than the remote filesystem.

The Remote Workflow Editor is installed on the KNIME Analytics Platform as part of the KNIME Server Connector extension, and on the KNIME Server it must be installed into each executor. Detailed instructions are found below.

It’s possible to create and open a new job from a workflow residing on the KNIME Server, using the KNIME Analytics Platform, by using the 'Open Job' context menu. See:

Jobs that are already created, e.g. by using the Execute context menu, a scheduled job, or a job started in the WebPortal, can be visualized by selecting the job and using the 'Open Job' context menu. See:

All jobs (executed from Analytics Platform, or via WebPortal) can be viewed, meaning that it’s possible to see node execution progress, number of rows/columns generated, and any warning/error messages.

It’s also possible to view and edit configuration settings, of most nodes as you would if the workflow was on your local KNIME Analytics Platform. Currently it’s not supported to configure file paths in some file reader nodes.

It’s also possible to move, add and remove nodes from the workbench, as you would for a local workflow.

You will be able to see which nodes are currently executing, which are already executed, and which are queued to be the next in execution. You can see errors and warning in the workflow by mouseover on the respective sign.

The server installer will create a customization template profile in config/client-profiles.template/customizations. It consists of a preference file that contains all available configuration settings (including detailed descriptions) as well as some additional files that may be referenced in the preference file. Please see customizations.epf for details.

In order to enable server-managed customization on the server side you have to create one or more subdirectories inside <server-repository>/config/client-profiles. New server installations already come with an example profile that you can use as a starting point. You can have an arbitrary number of profiles. Which profiles are fetched by the client and in which order is defined by settings in the client (see below). If more than one profile defines a preference value, the last profile in the list requested by the client will determine the actual default value. Let’s have a look at an example.

Suppose the config/client-profiles folder on the server has the following contents:

If the client request the profiles "base,linux" (in this order), the default number of threads used by KNIME nodes will be 8. The python paths are set to the correct Linux paths. If another client requests "base,windows" the default number of threads will be 4 (from the base profile) and the Python 3 path will be set to a folder on the C:\ drive. The pre-defined KNIME Explorer mount points will be identical for both clients because the value is only defined in the base profile.

A profile may contain several preferences files. They are all virtually combined into a single preference file for this profile in alphabetical order.

A profile may contain additional resources, for example JDBC driver files. The entire contents of the client-profiles folder including hidden files is sent to the client as a zip file and unpacked into a location in the client workspace. There is no conflict handling for any other files in the requested profiles (e.g. my-db-driver.jar) because they will end up in separate subdirectories on the client and not be processed further.

For further details and an example on how to distribute JDBC driver files go to the Server-managed Customization Profiles section of the KNIME Database Extension Guide.

If KNIME Server is running on Linux or macOS then the permissions of files inside profiles are transferred to the clients. This is useful for executable files on Linux or macOS clients, such as shell scripts. If you have such files in your profiles make sure to set the permissions accordingly on the server. KNIME Server’s running on Windows don’t support this feature because Windows file systems don’t have the concept of executable files.

Note that the profiles on the server are accessible without user authentication therefore they shouldn’t contain any confidential data such as passwords.

In order to create preference files for clients, start a KNIME Analytics Platform with a fresh workspace on the desired environments (e.g. Linux, Windows). This ensures that all preferences are set to their vendor defaults. Then change the preferences to your needs and export them via File → Export → KNIME Preferences. Then copy the resulting epf file to the profile folder on the server.

The client has three possibilities to request profiles from a KNIME Server.

The three possibilities are tried in exactly this order, i.e. if one of them provides a server address and a non-empty list of profiles it will be used and all following providers will be skipped.

It’s also possible to provide a local file system folder as the profileLocation on the command line (or in your custom profile provider). The layout of this local folder must be the same as the profiles folder on the server.

The configuration files must be accessible by the system account running the KNIME Server. However, this account also runs the KNIME Executor which executes the workflows. This means that a malicious workflow can in principle access the server configuration files if the absolute file system paths are known. Therefore, for high security environments we recommend removing write permissions on the configurations files from the system account so that at least the workflow cannot modify them. This includes the following directories and their contained files:

Communication between KNIME Analytics Platform and KNIME Server is performed via HTTP(S). By default, both unencrypted communication via HTTP and encrypted communication via HTTPS (SSL) is enabled.

All encryption is handled by TomEE, see the Tomcat SSL Configuration How-to for full documentation.

The default KNIME Server installation does not add any users with permissions to access the manager application. The Tomcat manager application is not required for the correct functioning of KNIME Server. You may wish to disable the functionality by deleting the manager, host-manager and ROOT directories from your installation. Note that you should not delete the ROOT directory if you chose to install KNIME Server using the context root of ROOT.

The Tomcat shutdown port is accessible on port 8005, which should not be accessible from machines other than localhost. We have renamed the SHUTDOWN command to a random string that is generated at installation time.

You may choose to remove this option completely by finding the following configuration in the server.xml:

and changing it to: <Server port="-1" shutdown="<RANDOMSTRING>">

Cross-site request forgery (CSRF) is a type of malicious exploit of a website where unauthorized commands are transmitted from a user that the website trusts (see the Wikipedia entry for more technical details). In the context of KNIME Server this means that some other web page issues a (hidden) REST request to KNIME Server using the current user’s active WebPortal session. The user usually doesn’t notice anything but operations are performed with their account. Since version 4.3.4 KNIME Server contains a CSRF protection which prevents any modification requests (e.g. POST, PUT, or DELETE) to REST methods from hosts other than KNIME Server itself.

In case you have internal web pages on other hosts that deliberately perform valid requests you can disable CSRF protection by adding the following line to <apache-tomee>/conf/Catalina/localhost/knime.xml:

Clickjacking is also a malicious attempt to trick a user into clicking on something different than perceived, potentially revealing confidential information or taking control of the computer. (See the Wikipedia entry for more technical details). The best option to avoid clickjacking is setting the HTTP header X-Frame-Options to an appropriate value to prevent the WebPortal being embedded in a third party website. In KNIME Server this can be done with a configuration option com.knime.server.webportal.restrict_x_frame_options. The value can be one of DENY, SAMEORIGIN or ALLOW-FROM any_origin_url. See also this article from MDN about more details of the header and available options.

Please note that, if you want to embed the WebPortal on a different website and want this setting to be enabled, you will have to set the value to ALLOW-FROM xxx (where xxx has to be replaced with the URL of the embedding website).

By default, Tomcat prints its name and version number on error pages (e.g. if a location entered in the browser does not exist) and in standard HTTP headers. This information can be used by an attacker to target potential security issues for this particular version. Therefore for high security environments it’s recommended to at least hide the server’s version. Fresh installations from 4.5 onwards already hide the version. If you are upgrading from an existing installation, you can apply the following two small configuration changes:

You may also choose to set the following parameter in the knime-server.config file. For full details see KNIME Server configuration file options:

com.knime.server.webportal.hide_version=true

There are a couple more actions you can take to make the server and the application even more secure which we don’t discuss in detail here because they are only useful in special setups. Example are

The following browsers are supported by KNIME WebPortal, we do not actively test or support KNIME WebPortal in in older browser versions.

Most WebPortal functionality may work with older browsers, although this is not tested.

Please note that IE8 and below is not supported.

The layout and styles of the WebPortal are customizable and controllable using templates. The KNIME Server installation includes two example templates, webportalTemplate.default, and webportalTemplate.goldMining.

If you wish to change the look and feel, add your own components, or embed the WebPortal into your corporate environment you can use one of the templates in the server-repository/config folder in the server installation package for inspiration.

A custom template can be deployed under <server repository>/config/webportalTemplate (simply rename one of the example template folders as a starting point).

The customization can be done in 4 parts:

Any additional resources (images, libraries, etc.) can be placed into this folder as well. On server startup, this folder is copied to a location that is accessible to a web browser. You can reference these resources directly in the CSS file (e.g. background-image: url(logo.png);) and prepend the custom folder in any template file (e.g. <img src="custom/logo.png">).

The template files are HTML fragments placed into the layout of the WebPortal page. There are several placeholders that are filled during runtime with the corresponding dynamic components. A placeholder is defined by an HTML element that has a location attribute. The tables below list all possible placeholders.

To debug and troubleshoot your custom WebPortal templates please use the development tools of your preferred browser. A long-waiting request during page layout will most-likely be due to a mandatory component missing. Please also note that the CSS file is added to the page before the regular stylesheet. If you wish to overwrite styles you need to define new classes or ids in your template files or use the !important keyword.

The KNIME WebPortal can be used with an integrated molecular sketcher. The server installation package contains additional WAR files in the sketchers folder. In order to use one of these sketcher copy the corresponding WAR file into <tomee-folder>/webapps and configure as described below. The WAR file should automatically be extracted into a folder of the same name. You may need to restart TomEE before the WAR is extracted.

If the KNIME WebPortal is installed, a KNIME Server administration page will available, too. It can be accessed by logging into the WebPortal through a web browser and clicking on the corresponding link at the top right.

In order to have access to the administration page, a user must have administrator privileges. Users can be granted administrator privileges via the server configuration file (please see section Server administrator).

The administration page provides details about the server’s status (see Server status), an overview of workflow jobs (see Jobs), and allow to manage local users and groups (see User groups). Please note that the users and groups management will only be available with a specific server configuration as described in section User groups.

The server stores the owner of each server item, which is the user that created the item. When you upload a flow, copy a workflow, save a workflow job (an executed flow) or create a new workflow group you are assigned to the new item as owner. When a new server item is created, you can set the permissions how you want this item to be available to other users. Later on, only the owner can change permissions on an item.

When the KNIME Server administrator defines the users that have access to the KNIME Server, the users are assigned to groups. Groups can be defined as needed — for example one group per department, or per research group, etc. Each user must be in at least one group, and could be in many groups.
You can set a group to be an administrator group (with the configuration option “com.knime.server.server_admin_group=<group name>”). Users assigned to that group are considered server administrators.

Specific users can be set server administrator with a configuration option (com.knime.server.server_admin_users=<user>,<user>,…​,) or by assigning them to the administrator group (see section User groups). Server administrators are not restricted by any access permissions. Administrators always have the right to perform any action usually controlled by user access rights. They can always change the owner of an item, change the permissions of an item, they see all workflow jobs (while regular users only see their own jobs) and they can delete all jobs and items.

There are three different access rights that control access to a workflow and two for a workflow group:

There are no permissions to be set on a workflow job or a scheduled job. Only the owner — the user that created the job — can see the job in the repository view, and he is the only user that can delete it (besides any server administrator).

In order to store a workflow job as new workflow in the server’s repository, the user needs the right to download the original workflow (the flow the job was created from). (This is a requirement, because the newly created workflow is owned by the user that stores the job — and the owner can easily grant itself the right to download the flow. Thus, if the original flow didn’t have the download right set, the user that is allowed to execute the flow could easily work around the missing download right.)

As the owner of a server item (workflow, shared component or workflow group) you can grant access rights to other users. But you can only assign permissions on a group level, not for particular users.

KNIME Server supports execution of workflows via a REST interface. The entry point for the REST interface is http://server-address/knime/rest/.

The interface is based on a hypermedia-aware JSON format called Mason. Details about the interface, its operations, endpoints and message formats are provided at the following locations (best opened in an internet browser):

(see also the "Link" HTTP header in all responses returned by the server).

The usual starting point to query the repository and to execute operations is
http://<server-address>/knime/rest/v4/repository/
(note the trailing ‘/’). The returned document also contains links to further operations.

The KNIME Server automatically generates SwaggerUI pages for all workflows that are present on the KNIME Server. From the KNIME Analytics Platform you can access that functionality using the Show API definition context menu item.

Clicking the menu item will open a SwaggerUI page for that workflow in your browser. It’s also possible to browse to that page using the REST API as described in the above section.

If the values of flow variables are changed in the remote execution dialog, the flow must be reset in order for the new values to be propagated. In this case, don’t remove the checkmark "Reset before Execution" in the execution dialog.

If the KNIME instance that is used to execute flows on the server doesn’t seem to have the settings specified in the knime.ini file, it is possible that the server didn’t find the ini-file: The server takes the default ini-file from the same folder as the KNIME executable. If you specify a wrapper script as executable that is located outside the installation folder it doesn’t find the default ini-file. In this case copy the ini-file from the installation folder into <server-repository>/config.

In some cases it may take quite some time (up to several minutes) until the server responds to requests on Linux systems.

KNIME Server 4.10.5 (released November 4, 2020)

KNIME Server 4.10.4 (released August 26, 2020)

KNIME Server 4.10.3 (released April 6, 2020)

KNIME Server 4.10.2 (released March 5, 2020)

KNIME Server 4.10.1 (released February 5, 2020)

KNIME Server 4.10.0 (released December 6, 2019)

1. Definitions. 1.1. "Contributor" means each individual or entity that creates or contributes to the creation of Modifications. 1.2. "Contributor Version" means the combination of the Original Software, prior Modifications used by a Contributor (if any), and the Modifications made by that particular Contributor. 1.3. "Covered Software" means (a) the Original Software, or (b) Modifications, or (c) the combination of files containing Original Software with files containing Modifications, in each case including portions thereof. 1.4. "Executable" means the Covered Software in any form other than Source Code. 1.5. "Initial Developer" means the individual or entity that first makes Original Software available under this License. 1.6. "Larger Work" means a work which combines Covered Software or portions thereof with code not governed by the terms of this License. 1.7. "License" means this document. 1.8. "Licensable" means having the right to grant, to the maximum extent possible, whether at the time of the initial grant or subsequently acquired, any and all of the rights conveyed herein. 1.9. "Modifications" means the Source Code and Executable form of any of the following: A. Any file that results from an addition to, deletion from or modification of the contents of a file containing Original Software or previous Modifications; B. Any new file that contains any part of the Original Software or previous Modification; or C. Any new file that is contributed or otherwise made available under the terms of this License. 1.10. "Original Software" means the Source Code and Executable form of computer software code that is originally released under this License. 1.11. "Patent Claims" means any patent claim(s), now owned or hereafter acquired, including without limitation, method, process, and apparatus claims, in any patent Licensable by grantor. 1.12. "Source Code" means (a) the common form of computer software code in which modifications are made and (b) associated documentation included in or with such code. 1.13. "You" (or "Your") means an individual or a legal entity exercising rights under, and complying with all of the terms of, this License. For legal entities, "You" includes any entity which controls, is controlled by, or is under common control with You. For purposes of this definition, "control" means (a) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (b) ownership of more than fifty percent (50%) of the outstanding shares or beneficial ownership of such entity. 2. License Grants. 2.1. The Initial Developer Grant. Conditioned upon Your compliance with Section 3.1 below and subject to third party intellectual property claims, the Initial Developer hereby grants You a world-wide, royalty-free, non-exclusive license: (a) under intellectual property rights (other than patent or trademark) Licensable by Initial Developer, to use, reproduce, modify, display, perform, sublicense and distribute the Original Software (or portions thereof), with or without Modifications, and/or as part of a Larger Work; and (b) under Patent Claims infringed by the making, using or selling of Original Software, to make, have made, use, practice, sell, and offer for sale, and/or otherwise dispose of the Original Software (or portions thereof). (c) The licenses granted in Sections 2.1(a) and (b) are effective on the date Initial Developer first distributes or otherwise makes the Original Software available to a third party under the terms of this License. (d) Notwithstanding Section 2.1(b) above, no patent license is granted: (1) for code that You delete from the Original Software, or (2) for infringements caused by: (i) the modification of the Original Software, or (ii) the combination of the Original Software with other software or devices. 2.2. Contributor Grant. Conditioned upon Your compliance with Section 3.1 below and subject to third party intellectual property claims, each Contributor hereby grants You a world-wide, royalty-free, non-exclusive license: (a) under intellectual property rights (other than patent or trademark) Licensable by Contributor to use, reproduce, modify, display, perform, sublicense and distribute the Modifications created by such Contributor (or portions thereof), either on an unmodified basis, with other Modifications, as Covered Software and/or as part of a Larger Work; and (b) under Patent Claims infringed by the making, using, or selling of Modifications made by that Contributor either alone and/or in combination with its Contributor Version (or portions of such combination), to make, use, sell, offer for sale, have made, and/or otherwise dispose of: (1) Modifications made by that Contributor (or portions thereof); and (2) the combination of Modifications made by that Contributor with its Contributor Version (or portions of such combination). (c) The licenses granted in Sections 2.2(a) and 2.2(b) are effective on the date Contributor first distributes or otherwise makes the Modifications available to a third party. (d) Notwithstanding Section 2.2(b) above, no patent license is granted: (1) for any code that Contributor has deleted from the Contributor Version; (2) for infringements caused by: (i) third party modifications of Contributor Version, or (ii) the combination of Modifications made by that Contributor with other software (except as part of the Contributor Version) or other devices; or (3) under Patent Claims infringed by Covered Software in the absence of Modifications made by that Contributor. 3. Distribution Obligations. 3.1. Availability of Source Code. Any Covered Software that You distribute or otherwise make available in Executable form must also be made available in Source Code form and that Source Code form must be distributed only under the terms of this License. You must include a copy of this License with every copy of the Source Code form of the Covered Software You distribute or otherwise make available. You must inform recipients of any such Covered Software in Executable form as to how they can obtain such Covered Software in Source Code form in a reasonable manner on or through a medium customarily used for software exchange. 3.2. Modifications. The Modifications that You create or to which You contribute are governed by the terms of this License. You represent that You believe Your Modifications are Your original creation(s) and/or You have sufficient rights to grant the rights conveyed by this License. 3.3. Required Notices. You must include a notice in each of Your Modifications that identifies You as the Contributor of the Modification. You may not remove or alter any copyright, patent or trademark notices contained within the Covered Software, or any notices of licensing or any descriptive text giving attribution to any Contributor or the Initial Developer. 3.4. Application of Additional Terms. You may not offer or impose any terms on any Covered Software in Source Code form that alters or restricts the applicable version of this License or the recipients' rights hereunder. You may choose to offer, and to charge a fee for, warranty, support, indemnity or liability obligations to one or more recipients of Covered Software. However, you may do so only on Your own behalf, and not on behalf of the Initial Developer or any Contributor. You must make it absolutely clear that any such warranty, support, indemnity or liability obligation is offered by You alone, and You hereby agree to indemnify the Initial Developer and every Contributor for any liability incurred by the Initial Developer or such Contributor as a result of warranty, support, indemnity or liability terms You offer. 3.5. Distribution of Executable Versions. You may distribute the Executable form of the Covered Software under the terms of this License or under the terms of a license of Your choice, which may contain terms different from this License, provided that You are in compliance with the terms of this License and that the license for the Executable form does not attempt to limit or alter the recipient's rights in the Source Code form from the rights set forth in this License. If You distribute the Covered Software in Executable form under a different license, You must make it absolutely clear that any terms which differ from this License are offered by You alone, not by the Initial Developer or Contributor. You hereby agree to indemnify the Initial Developer and every Contributor for any liability incurred by the Initial Developer or such Contributor as a result of any such terms You offer. 3.6. Larger Works. You may create a Larger Work by combining Covered Software with other code not governed by the terms of this License and distribute the Larger Work as a single product. In such a case, You must make sure the requirements of this License are fulfilled for the Covered Software. 4. Versions of the License. 4.1. New Versions. Oracle is the initial license steward and may publish revised and/or new versions of this License from time to time. Each version will be given a distinguishing version number. Except as provided in Section 4.3, no one other than the license steward has the right to modify this License. 4.2. Effect of New Versions. You may always continue to use, distribute or otherwise make the Covered Software available under the terms of the version of the License under which You originally received the Covered Software. If the Initial Developer includes a notice in the Original Software prohibiting it from being distributed or otherwise made available under any subsequent version of the License, You must distribute and make the Covered Software available under the terms of the version of the License under which You originally received the Covered Software. Otherwise, You may also choose to use, distribute or otherwise make the Covered Software available under the terms of any subsequent version of the License published by the license steward. 4.3. Modified Versions. When You are an Initial Developer and You want to create a new license for Your Original Software, You may create and use a modified version of this License if You: (a) rename the license and remove any references to the name of the license steward (except to note that the license differs from this License); and (b) otherwise make it clear that the license contains terms which differ from this License. 5. DISCLAIMER OF WARRANTY. COVERED SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES THAT THE COVERED SOFTWARE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED SOFTWARE IS WITH YOU. SHOULD ANY COVERED SOFTWARE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY COVERED SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER. 6. TERMINATION. 6.1. This License and the rights granted hereunder will terminate automatically if You fail to comply with terms herein and fail to cure such breach within 30 days of becoming aware of the breach. Provisions which, by their nature, must remain in effect beyond the termination of this License shall survive. 6.2. If You assert a patent infringement claim (excluding declaratory judgment actions) against Initial Developer or a Contributor (the Initial Developer or Contributor against whom You assert such claim is referred to as "Participant") alleging that the Participant Software (meaning the Contributor Version where the Participant is a Contributor or the Original Software where the Participant is the Initial Developer) directly or indirectly infringes any patent, then any and all rights granted directly or indirectly to You by such Participant, the Initial Developer (if the Initial Developer is not the Participant) and all Contributors under Sections 2.1 and/or 2.2 of this License shall, upon 60 days notice from Participant terminate prospectively and automatically at the expiration of such 60 day notice period, unless if within such 60 day period You withdraw Your claim with respect to the Participant Software against such Participant either unilaterally or pursuant to a written agreement with Participant. 6.3. If You assert a patent infringement claim against Participant alleging that the Participant Software directly or indirectly infringes any patent where such claim is resolved (such as by license or settlement) prior to the initiation of patent infringement litigation, then the reasonable value of the licenses granted by such Participant under Sections 2.1 or 2.2 shall be taken into account in determining the amount or value of any payment or license. 6.4. In the event of termination under Sections 6.1 or 6.2 above, all end user licenses that have been validly granted by You or any distributor hereunder prior to termination (excluding licenses granted to You by any distributor) shall survive termination. 7. LIMITATION OF LIABILITY. UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL YOU, THE INITIAL DEVELOPER, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF COVERED SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO ANY PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF SUCH PARTY SHALL HAVE BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES. THIS LIMITATION OF LIABILITY SHALL NOT APPLY TO LIABILITY FOR DEATH OR PERSONAL INJURY RESULTING FROM SUCH PARTY'S NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH LIMITATION. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THIS EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU. 8. U.S. GOVERNMENT END USERS. The Covered Software is a "commercial item," as that term is defined in 48 C.F.R. 2.101 (Oct. 1995), consisting of "commercial computer software" (as that term is defined at 48 C.F.R. § 252.227-7014(a)(1)) and "commercial computer software documentation" as such terms are used in 48 C.F.R. 12.212 (Sept. 1995). Consistent with 48 C.F.R. 12.212 and 48 C.F.R. 227.7202-1 through 227.7202-4 (June 1995), all U.S. Government End Users acquire Covered Software with only those rights set forth herein. This U.S. Government Rights clause is in lieu of, and supersedes, any other FAR, DFAR, or other clause or provision that addresses Government rights in computer software under this License. 9. MISCELLANEOUS. This License represents the complete agreement concerning subject matter hereof. If any provision of this License is held to be unenforceable, such provision shall be reformed only to the extent necessary to make it enforceable. This License shall be governed by the law of the jurisdiction specified in a notice contained within the Original Software (except to the extent applicable law, if any, provides otherwise), excluding such jurisdiction's conflict-of-law provisions. Any litigation relating to this License shall be subject to the jurisdiction of the courts located in the jurisdiction and venue specified in a notice contained within the Original Software, with the losing party responsible for costs, including, without limitation, court costs and reasonable attorneys' fees and expenses. The application of the United Nations Convention on Contracts for the International Sale of Goods is expressly excluded. Any law or regulation which provides that the language of a contract shall be construed against the drafter shall not apply to this License. You agree that You alone are responsible for compliance with the United States export administration regulations (and the export control laws and regulation of any other countries) when You use, distribute or otherwise make available any Covered Software. 10. RESPONSIBILITY FOR CLAIMS. As between Initial Developer and the Contributors, each party is responsible for claims and damages arising, directly or indirectly, out of its utilization of rights under this License and You agree to work with Initial Developer and Contributors to distribute such responsibility on an equitable basis. Nothing herein is intended or shall be deemed to constitute any admission of liability. NOTICE PURSUANT TO SECTION 9 OF THE COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) The code released under the CDDL shall be governed by the laws of the State of California (excluding conflict-of-law provisions). Any litigation relating to this License shall be subject to the jurisdiction of the Federal Courts of the Northern District of California and the state courts of the State of California, with venue lying in Santa Clara County, California. The GNU General Public License (GPL) Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 51 Franklin Street, Fifth Floor Boston, MA 02110-1335 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. One line to give the program's name and a brief idea of what it does. Copyright (C) <year> <name of author> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. signature of Ty Coon, 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License. Certain source files distributed by Oracle America, Inc. and/or its affiliates are subject to the following clarification and special exception to the GPLv2, based on the GNU Project exception for its Classpath libraries, known as the GNU Classpath Exception, but only where Oracle has expressly included in the particular source file's header the words "Oracle designates this particular file as subject to the "Classpath" exception as provided by Oracle in the LICENSE file that accompanied this code." You should also note that Oracle includes multiple, independent programs in this software package. Some of those programs are provided under licenses deemed incompatible with the GPLv2 by the Free Software Foundation and others. For example, the package includes programs licensed under the Apache License, Version 2.0. Such programs are licensed to you under their original licenses. Oracle facilitates your further distribution of this package by adding the Classpath Exception to the necessary parts of its GPLv2 code, which permits you to use that code in combination with other independent modules not licensed under the GPLv2. However, note that this would not permit you to commingle code under an incompatible license with Oracle's GPLv2 licensed code by, for example, cutting and pasting such code into a file also containing Oracle's GPLv2 licensed code and then distributing the result. Additionally, if you were to remove the Classpath Exception from any of the files to which it applies and distribute the result, you would likely be required to license some or all of the other code in that distribution under the GPLv2 as well, and since the GPLv2 is incompatible with the license terms of some items included in the distribution by Oracle, removing the Classpath Exception could therefore effectively compromise your ability to further distribute the package. Proceed with caution and we recommend that you obtain the advice of a lawyer skilled in open source matters before removing the Classpath Exception or making modifications to this package which may subsequently be redistributed and/or involve the use of third party software. CLASSPATH EXCEPTION Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License version 2 cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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¹ The server managed customizations functionality of KNIME Server up to version 4.13.3 is vulnerable to Directory Path Traversal attacks. By manipulating variables that reference files by prepending “dot-dot-slash (../)” sequences and their variations or by using absolute file paths, it is possible to access arbitrary files and directories stored on the file system including application source code, configuration, and database. Due to the file-based architecture of KNIME Server, this vulnerability allows stealing users' data such as password hashes, workflows, licenses, jobs, and so on. No authentication is required to exploit this vulnerability. The vulnerability was found and reported by Dawid Czarnecki from NATO and is recorded as CVE-2021-44726

² The old KNIME WebPortal login page up to version 4.13.3 contains a DOM-based XSS vulnerability that once exploited, can be used to run any action as a victim user via malicious JavaScript. If the victim user is an administrator, it could be used to create a new administrator. To exploit the vulnerability it is required to create a specially crafted URL and convince the victim to open it. No authentication is required to exploit the vulnerability, however, authenticated users can be targeted. The vulnerability was found and reported by Dawid Czarnecki from NATO and is recorded as CVE-2021-44725