How To Fix SAML2158 - Problem with endpoint URL '&1' evaluation with regular expression

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 158

• Message text: Problem with endpoint URL '&1' evaluation with regular expression

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAML2158 - Problem with endpoint URL '&1' evaluation with regular expression ?

  The SAP error message SAML2158 indicates that there is a problem with the evaluation of an endpoint URL against a regular expression. This error typically occurs in the context of Single Sign-On (SSO) configurations using SAML (Security Assertion Markup Language).
  Cause:
  The error is usually caused by one of the following issues:
  
  Invalid URL Format: The endpoint URL specified in the SAML configuration does not conform to the expected format or contains invalid characters.
  Regular Expression Mismatch: The regular expression used to validate the endpoint URL is not correctly defined, leading to a mismatch.
  Configuration Errors: There may be misconfigurations in the SAML settings, such as incorrect entity IDs or endpoint URLs.
  Whitespace or Special Characters: The URL may contain leading or trailing whitespace or special characters that are not handled correctly by the regular expression.
  
  Solution:
  To resolve the SAML2158 error, you can take the following steps:
  
  
  Check the Endpoint URL:
  
  Verify that the endpoint URL is correctly formatted and does not contain any invalid characters.
  Ensure that the URL is accessible and correctly points to the intended service.
  
  
  
  Review Regular Expression:
  
  Check the regular expression used for validating the endpoint URL. Ensure that it is correctly defined to match the expected URL format.
  If you are not familiar with regular expressions, consider consulting documentation or a regex testing tool to validate the expression.
  
  
  
  Update SAML Configuration:
  
  Go through the SAML configuration settings in your SAP system and ensure that all values are correctly set, including entity IDs and endpoint URLs.
  Make sure that there are no typos or incorrect entries.
  
  
  
  Remove Whitespace:
  
  Ensure that there are no leading or trailing spaces in the endpoint URL. Trim any unnecessary whitespace.
  
  
  
  Test the Configuration:
  
  After making changes, test the SAML configuration to see if the error persists. You may need to restart the relevant services or clear caches.
  
  
  
  Related Information:
  
  SAML Documentation: Refer to SAP's official documentation on SAML configurations for detailed guidelines on setting up SSO and troubleshooting common issues.
  Regular Expression Resources: If you need help with regular expressions, there are many online resources and tools available that can help you create and test regex patterns.
  SAP Notes: Check SAP Notes for any known issues or patches related to SAML configurations that might address this error.
  
  If the problem persists after following these steps, consider reaching out to SAP support for further assistance.