How To Fix SAML2136 - No assertion provided for validation

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 136

• Message text: No assertion provided for validation

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 SAML2136 - No assertion provided for validation ?

  The SAP error message SAML2136: No assertion provided for validation typically occurs in the context of Single Sign-On (SSO) implementations using Security Assertion Markup Language (SAML). This error indicates that the system expected a SAML assertion to be present for validation, but none was provided.
  Causes:
  
  Missing Assertion: The SAML response from the Identity Provider (IdP) does not contain a SAML assertion.
  Incorrect Configuration: There may be a misconfiguration in the SSO setup, such as incorrect endpoints or settings in the Service Provider (SP) or IdP.
  Network Issues: Network problems may prevent the SAML assertion from being transmitted properly.
  Expired or Invalid Assertion: The assertion may have expired or been invalidated, leading to its absence during validation.
  Client-Side Issues: Issues on the client side, such as browser settings or extensions, may interfere with the SAML response.
  
  Solutions:
  
  Check SAML Response: Use tools like SAML-tracer (a browser extension) to inspect the SAML response from the IdP. Ensure that the response contains a valid assertion.
  Review Configuration: Verify the configuration settings in both the IdP and SP. Ensure that the endpoints, certificates, and other settings are correctly configured.
  Check Logs: Review the logs on both the IdP and SP sides for any errors or warnings that could provide more context about the issue.
  Test with Different Browsers: Sometimes, browser settings or extensions can interfere with SSO. Test the SSO flow in different browsers or in incognito mode.
  Validate Assertion: If the assertion is present but still causing issues, validate its contents (e.g., check the signature, expiration time, audience, etc.) to ensure it meets the expected criteria.
  Consult Documentation: Refer to the SAP documentation for SSO and SAML configurations to ensure compliance with best practices.
  
  Related Information:
  
  SAML Assertions: These are XML documents that contain the authentication and authorization information about a user. They are crucial for SSO implementations.
  Identity Provider (IdP): The entity that authenticates users and provides SAML assertions to the Service Provider.
  Service Provider (SP): The entity that consumes the SAML assertions and grants access to the user based on the information provided.
  Debugging Tools: Tools like SAML-tracer, Fiddler, or browser developer tools can help trace the SAML flow and identify where the issue occurs.
  
  If the problem persists after trying the above solutions, it may be beneficial to reach out to SAP support or consult with your organization's IT team for further assistance.