How To Fix SAML2099 - System expected one of the digest algorithms: &1, but received &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 099

• Message text: System expected one of the digest algorithms: &1, but received &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAML2099 - System expected one of the digest algorithms: &1, but received &2 ?

  The SAP error message SAML2099 indicates a mismatch between the expected and received digest algorithms during a SAML (Security Assertion Markup Language) authentication process. This error typically occurs when the system is configured to accept specific digest algorithms, but the incoming SAML assertion uses a different algorithm.
  Cause:
  The error message specifies that the system expected one of the specified digest algorithms (e.g., SHA-1, SHA-256) but received a different one. This can happen due to several reasons:
  
  Configuration Mismatch: The Identity Provider (IdP) is configured to use a different digest algorithm than what the Service Provider (SP) is expecting.
  Outdated Configuration: The SP may have an outdated configuration that does not support newer digest algorithms.
  SAML Assertion Issues: The SAML assertion being sent by the IdP may be incorrectly configured or generated with an unsupported algorithm.
  
  Solution:
  To resolve the SAML2099 error, you can take the following steps:
  
  
  Check Configuration:
  
  Verify the digest algorithms configured in both the IdP and SP. Ensure that they match.
  In SAP, you can check the SAML configuration in transaction SAML2 or SAML2_CONFIG.
  
  
  
  Update Digest Algorithms:
  
  If the IdP is using a newer digest algorithm (e.g., SHA-256), ensure that the SP is also configured to accept this algorithm.
  Update the SP configuration to include the expected digest algorithms.
  
  
  
  Consult Documentation:
  
  Review the documentation for both the IdP and SP to understand the supported algorithms and how to configure them properly.
  
  
  
  Test with Different Algorithms:
  
  If possible, test the SAML assertion with different digest algorithms to identify which ones are supported by both parties.
  
  
  
  Contact Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support or the support team for your IdP for further assistance.
  
  
  
  Related Information:
  
  SAML Protocol: Understanding the SAML protocol and how it handles assertions, signatures, and digest algorithms can help in troubleshooting.
  Security Best Practices: Ensure that you are using secure and up-to-date algorithms to protect against vulnerabilities.
  Logs and Traces: Check the logs in both the SAP system and the IdP for more detailed error messages that can provide additional context.
  
  By following these steps, you should be able to identify and resolve the cause of the SAML2099 error in your SAP environment.