How To Fix SNC721 - SNC deactivated, request refused

SAP Error Message - Details

• Message type: E = Error

• Message class: SNC - Secure Network Communication, SNC

• Message number: 721

• Message text: SNC deactivated, request refused

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SNC721 - SNC deactivated, request refused ?

  The SAP error message SNC721: SNC deactivated, request refused typically indicates that the Secure Network Communications (SNC) is not enabled or properly configured in your SAP system. SNC is used to provide secure communication between SAP systems and clients, and if it is deactivated, any requests that require secure communication will be refused.
  Causes:
  
  SNC Not Configured: The SNC settings may not be configured in the SAP system.
  SNC Library Missing: The required SNC library may not be installed or accessible.
  SNC Disabled: SNC may be explicitly disabled in the system settings.
  Incorrect SNC Parameters: The parameters for SNC may be incorrectly set, leading to a failure in establishing a secure connection.
  Client Configuration: The client (e.g., SAP GUI) may not be configured to use SNC.
  
  Solutions:
  
  
  Check SNC Configuration:
  
  Go to transaction RZ10 and check the profile parameters related to SNC. Ensure that snc/enable is set to 1 (enabled).
  Verify that the snc/identity/as parameter is correctly set to the identity of the system.
  
  
  
  Install SNC Library:
  
  Ensure that the required SNC library (e.g., SAP Cryptographic Library) is installed on the server and is accessible.
  
  
  
  Enable SNC:
  
  If SNC is disabled, you can enable it by setting the appropriate parameters in the instance profile and restarting the SAP instance.
  
  
  
  Check Client Configuration:
  
  Ensure that the SAP GUI or other clients are configured to use SNC. This can usually be done in the SAP GUI options under the "SNC" tab.
  
  
  
  Review Security Settings:
  
  Check the security settings in the SAP system to ensure that they allow for SNC connections.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation for detailed steps on configuring SNC, as the exact steps may vary based on the version of SAP you are using.
  
  
  
  Related Information:
  
  
  SNC Parameters: Common parameters include:
  
  snc/enable: Enable or disable SNC.
  snc/identity/as: The SNC identity of the system.
  snc/identity/client: The SNC identity of the client.
  
  
  
  SAP Notes: Check for relevant SAP Notes that may provide additional guidance or patches related to SNC issues.
  
  
  Logs and Traces: Review the system logs (transaction SM21) and traces (transaction ST01) for more detailed error messages that can help diagnose the issue.
  
  
  SAP Support: If the issue persists after checking the above, consider reaching out to SAP Support for further assistance.
  
  
  By following these steps, you should be able to resolve the SNC721 error and re-establish secure communication in your SAP environment.