How To Fix SAPC_MESSAGE020 - WebSocket subprotocol &1 is for application &2 not supported !

SAP Error Message - Details

• Message type: E = Error

• Message class: SAPC_MESSAGE -

• Message number: 020

• Message text: WebSocket subprotocol &1 is for application &2 not supported !

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAPC_MESSAGE020 - WebSocket subprotocol &1 is for application &2 not supported ! ?

  The SAP error message SAPC_MESSAGE020 indicates that there is an issue with the WebSocket subprotocol being used in your SAP application. Specifically, it states that the subprotocol specified is not supported for the application you are trying to connect to.
  Cause:
  
  Unsupported Subprotocol: The WebSocket subprotocol you are trying to use is not recognized or supported by the SAP application server.
  Configuration Issues: There may be a misconfiguration in the WebSocket settings or the application itself that is leading to this error.
  Version Mismatch: The version of the SAP application or the WebSocket library being used may not support the specified subprotocol.
  Incorrect Application Identifier: The application identifier (&2 in the error message) may not be correctly set or may not match the expected value for the subprotocol being used.
  
  Solution:
  
  Check Supported Subprotocols: Review the documentation for the SAP application to determine which WebSocket subprotocols are supported. Ensure that you are using one of the supported subprotocols.
  Update Configuration: If you have control over the WebSocket configuration, ensure that the correct subprotocol is specified in your WebSocket connection settings.
  Verify Application Identifier: Make sure that the application identifier you are using is correct and corresponds to the application you are trying to connect to.
  Consult SAP Notes: Check the SAP Support Portal for any relevant notes or updates that may address this issue. There may be patches or updates that resolve compatibility issues.
  Test with Different Subprotocols: If possible, try connecting with different subprotocols to see if the issue persists. This can help identify if the problem is specific to a particular subprotocol.
  Contact SAP Support: If you are unable to resolve the issue, consider reaching out to SAP Support for assistance. Provide them with the error message and any relevant details about your configuration.
  
  Related Information:
  
  WebSocket Protocol: WebSockets are used for real-time communication between a client and server. Understanding how WebSockets work and their subprotocols can help in troubleshooting.
  SAP Application Logs: Check the application logs for any additional error messages or warnings that may provide more context about the issue.
  Documentation: Refer to the official SAP documentation for your specific application version to understand the supported features and configurations related to WebSockets.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution.