How To Fix TRUST133 - RSA with SHA-256

SAP Error Message - Details

• Message type: E = Error

• Message class: TRUST - Certificate Management

• Message number: 133

• Message text: RSA with SHA-256

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 TRUST133 - RSA with SHA-256 ?

  The SAP error message TRUST133 typically relates to issues with digital signatures and certificates, particularly when using RSA with SHA-256. This error can occur in various contexts, such as when dealing with secure communications, digital signatures, or certificate validation in SAP systems.
  Cause:
  
  Certificate Issues: The error may arise if the certificate being used is not trusted or is not properly configured. This can happen if the certificate is self-signed, expired, or not issued by a trusted Certificate Authority (CA).
  Algorithm Support: The SAP system may not support the SHA-256 hashing algorithm or the specific RSA key size being used. This can happen if the system is outdated or if the cryptographic settings are not properly configured.
  Configuration Problems: Incorrect settings in the SAP Trust Manager (transaction code STRUST) or in the SSL configuration can lead to this error.
  Missing or Incorrect Trust Relationships: If the trust relationship between the SAP system and the external system (e.g., a web service or another SAP system) is not established correctly, it can lead to this error.
  
  Solution:
  
  
  Check Certificates:
  
  Ensure that the certificate being used is valid, not expired, and issued by a trusted CA.
  If using self-signed certificates, make sure they are imported into the SAP Trust Store (STRUST) and marked as trusted.
  
  
  
  Update SAP System:
  
  Ensure that your SAP system is updated to a version that supports SHA-256. This may involve applying patches or upgrades.
  
  
  
  Configure Trust Manager:
  
  Use transaction code STRUST to manage certificates. Import the necessary certificates and ensure that they are correctly configured.
  Check the SSL settings and ensure that the correct SSL protocol and cipher suites are enabled.
  
  
  
  Review Cryptographic Settings:
  
  Check the cryptographic settings in the SAP system to ensure that SHA-256 is supported and enabled.
  You may need to adjust the settings in the SAP Cryptographic Library (SAPCRYPTOLIB) if applicable.
  
  
  
  Test Connectivity:
  
  After making changes, test the connectivity or the operation that was failing to ensure that the issue is resolved.
  
  
  
  Related Information:
  
  SAP Notes: Check for relevant SAP Notes that may provide additional guidance or patches related to the TRUST133 error. SAP Notes can be found in the SAP Support Portal.
  Documentation: Review the SAP documentation related to digital signatures, SSL configuration, and the Trust Manager for detailed instructions on managing certificates and trust relationships.
  Community Forums: Consider searching or posting in SAP community forums for additional insights from other users who may have encountered similar issues.
  
  If the problem persists after following these steps, it may be beneficial to engage SAP support for further assistance.