How To Fix SNC019 - Logon with external ID not activated in this system

SAP Error Message - Details

• Message type: E = Error

• Message class: SNC - Secure Network Communication, SNC

• Message number: 019

• Message text: Logon with external ID not activated in this system

What causes this issue?

The system attempted to execute a dialog logon via a server using an
external ID, such as an X.509 certificate. This option must be released
using the profile parameter snc/extid_login_diag.

System Response

The logon was refused and the connection was terminated.

How to fix this error?

The administrator may be able to activate the function by setting the
corresponding profile parameter.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SNC019 - Logon with external ID not activated in this system ?

  The SAP error message SNC019: Logon with external ID not activated in this system typically occurs when a user attempts to log on to an SAP system using an external identity (such as an external authentication method) that has not been properly configured or activated in the system.
  Cause:
  
  External ID Not Configured: The system is not set up to accept logons using external identities (like SSO or SNC).
  SNC Configuration Issues: Secure Network Communications (SNC) may not be properly configured in the SAP system.
  User Profile Settings: The user profile may not have the necessary settings to allow external ID logon.
  Authorization Issues: The user may not have the required authorizations to log in using the external ID.
  
  Solution:
  
  
  Check SNC Configuration:
  
  Ensure that SNC is properly configured in the SAP system. This includes checking the SNC parameters in the instance profile and ensuring that the SNC library is correctly installed.
  Use transaction RZ10 to check the instance profile settings for SNC parameters.
  
  
  
  Activate External ID Logon:
  
  If you want to allow logon with external IDs, you need to activate this feature in the system. This can typically be done in the SAP GUI by navigating to the appropriate configuration settings.
  You may need to adjust the settings in transaction SNC0 or SNC1 to enable external ID logon.
  
  
  
  User Profile Settings:
  
  Check the user profile in transaction SU01 to ensure that the user is set up correctly for external ID logon.
  Ensure that the user has the necessary roles and authorizations to log in using the external ID.
  
  
  
  Consult Documentation:
  
  Refer to the SAP documentation for your specific version to ensure that you are following the correct procedures for enabling external ID logon.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above configurations, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  SNC (Secure Network Communications): A security protocol that provides encryption and secure communication between SAP systems and clients.
  Single Sign-On (SSO): A user authentication process that allows a user to access multiple applications with one set of login credentials.
  User Authorizations: Ensure that the user has the necessary authorizations to perform the actions they are attempting.
  
  By following these steps, you should be able to resolve the SNC019 error and enable logon with external IDs in your SAP system.