How To Fix SNC100 - Unencrypted communication is rejected by this system

SAP Error Message - Details

• Message type: E = Error

• Message class: SNC - Secure Network Communication, SNC

• Message number: 100

• Message text: Unencrypted communication is rejected by this system

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SNC100 - Unencrypted communication is rejected by this system ?

  The SAP error message SNC100 indicates that the system is rejecting unencrypted communication. This typically occurs when Secure Network Communications (SNC) is enabled in the SAP system, but the communication attempt is not using the required encryption.
  Cause:
  
  SNC Configuration: The SAP system is configured to require SNC for secure communication, but the client or application trying to connect is not using SNC.
  Client Settings: The client application may not be configured to use SNC or may not have the necessary SNC parameters set.
  Network Security Policies: Organizational policies may enforce the use of encrypted communication, leading to this error if the client does not comply.
  
  Solution:
  To resolve the SNC100 error, you can take the following steps:
  
  
  Check SNC Configuration:
  
  Ensure that SNC is properly configured on both the SAP server and the client side. This includes verifying the SNC library and parameters in the SAP system.
  In the SAP GUI, you can check the SNC settings in the transaction RZ10 (for profile parameters) or SNC transaction.
  
  
  
  Client Configuration:
  
  If you are using SAP GUI, ensure that the SNC settings are correctly configured. You can do this by:
  
  Going to the SAP GUI options.
  Navigating to the "Security" tab.
  Ensuring that the "Use Secure Network Communication" option is checked and that the SNC name is correctly specified.
  
  
  
  
  
  SNC Name:
  
  Verify that the SNC name used in the client matches the SNC name configured in the SAP system. The SNC name typically follows the format p:CN=<CommonName>.
  
  
  
  Install SNC Library:
  
  Ensure that the necessary SNC library (e.g., SAP Cryptographic Library) is installed on the client machine and is accessible.
  
  
  
  Network Policies:
  
  If your organization has specific network security policies, ensure that the client complies with these policies. You may need to consult with your network security team.
  
  
  
  Testing:
  
  After making the necessary changes, test the connection again to see if the error persists.
  
  
  
  Related Information:
  
  SNC Documentation: Refer to the official SAP documentation on SNC for detailed configuration steps and requirements.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to SNC configuration or known bugs.
  Support: If the issue persists after following the above steps, consider reaching out to SAP support for further assistance.
  
  By ensuring that both the server and client are properly configured for SNC, you should be able to resolve the SNC100 error and establish a secure connection.