How To Fix 1S005 - SSF error: Invalid signer

SAP Error Message - Details

• Message type: E = Error

• Message class: 1S - Messages for SSF ("Secure Store & Forward")

• Message number: 005

• Message text: SSF error: Invalid signer

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message 1S005 - SSF error: Invalid signer ?

  The SAP error message 1S005 SSF error: Invalid signer typically occurs in the context of Secure Store and Forward (SSF) when there is an issue with the digital signature verification process. This error indicates that the system is unable to validate the signer of a digital document or message, which can be due to several reasons.
  Causes:
  
  Invalid or Expired Certificate: The certificate used for signing may be invalid, expired, or not trusted by the system.
  Missing Certificate: The public key of the signer may not be available in the trust store of the SAP system.
  Configuration Issues: Incorrect configuration of the SSF settings or the cryptographic library can lead to this error.
  Corrupted Key Storage: The key storage (e.g., PSE - Personal Security Environment) may be corrupted or improperly configured.
  Mismatched Algorithms: The signing algorithm used may not be supported or recognized by the SAP system.
  
  Solutions:
  
  
  Check Certificate Validity:
  
  Verify that the signing certificate is valid and has not expired.
  Ensure that the certificate chain is complete and trusted by the SAP system.
  
  
  
  Update Trust Store:
  
  Import the public key of the signer into the SAP system's trust store if it is missing.
  Use transaction STRUST to manage certificates and trust relationships.
  
  
  
  Review SSF Configuration:
  
  Check the SSF configuration settings in the SAP system to ensure they are correctly set up.
  Ensure that the correct cryptographic library is being used.
  
  
  
  Recreate PSE:
  
  If the PSE is corrupted, consider recreating it. This can be done using transaction STRUST.
  Backup the existing PSE before making changes.
  
  
  
  Check for Algorithm Compatibility:
  
  Ensure that the signing algorithm used is supported by the SAP system. If necessary, update the system or adjust the signing process to use a compatible algorithm.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  Transaction STRUST: This transaction is used to manage SSL certificates and trust relationships in SAP.
  PSE (Personal Security Environment): A storage for security-related information, including certificates and private keys.
  SAP Security Guide: Refer to the SAP Security Guide for best practices on managing certificates and security settings.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with SAP support or your organization's SAP Basis team for further assistance.