How To Fix SNC022 - Logon with external ID only possible with server logon

SAP Error Message - Details

• Message type: E = Error

• Message class: SNC - Secure Network Communication, SNC

• Message number: 022

• Message text: Logon with external ID only possible with server logon

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SNC022 - Logon with external ID only possible with server logon ?

  The SAP error message SNC022 indicates that a logon attempt using an external ID (such as an SNC name) is only possible when the server is configured to allow such logons. This typically occurs in environments where Secure Network Communications (SNC) is being used for authentication.
  Cause:
  The error can occur due to several reasons:
  
  Server Configuration: The SAP server is not configured to accept external IDs for logon. This can happen if the SNC settings are not properly set up in the SAP system.
  SNC Library Issues: The required SNC libraries may not be installed or configured correctly on the server or client side.
  User Configuration: The user account may not be set up correctly to use SNC for authentication.
  Network Issues: There may be network issues preventing proper communication between the client and server.
  
  Solution:
  To resolve the SNC022 error, you can take the following steps:
  
  
  Check Server Configuration:
  
  Ensure that the SAP server is configured to allow external ID logons. This can be done by checking the profile parameters related to SNC in the SAP system (e.g., snc/enable should be set to 1).
  Verify that the SNC name is correctly defined in the user master record (transaction SU01) for the user attempting to log in.
  
  
  
  Verify SNC Library:
  
  Ensure that the correct SNC library is installed and configured on both the client and server sides. This may involve checking the installation of the SAP Cryptographic Library or other relevant libraries.
  
  
  
  User Master Record:
  
  Check the user master record in transaction SU01 to ensure that the user is set up for SNC logon. The SNC name should be specified in the "Logon Data" tab.
  
  
  
  Network Configuration:
  
  Ensure that there are no network issues preventing the client from reaching the server. This includes checking firewalls, VPNs, and other network configurations.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation for SNC configuration and troubleshooting. This can provide additional insights into specific settings and requirements.
  
  
  
  SAP Notes:
  
  Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  SNC (Secure Network Communications): A security protocol that provides encryption and secure authentication for SAP systems.
  User Authentication: Understanding how user authentication works in SAP, especially with SNC, is crucial for troubleshooting.
  SAP Basis Administration: Knowledge of SAP Basis administration can be beneficial for making the necessary configuration changes.
  
  If the issue persists after following these steps, it may be necessary to engage with SAP support or consult with a Basis administrator for further assistance.