How To Fix CLB2660 - No SHA1 signature provided from SSFA

SAP Error Message - Details

• Message type: E = Error

• Message class: CLB2 - SAIL: Common messages

• Message number: 660

• Message text: No SHA1 signature provided from SSFA

What causes this issue?

A call to the service provider required an authentication using the RSA-
SHA1 algorithm. For this a signature has to be retrieved from the SSFA.

System Response

The method execution is canceled.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Check the configuration with transactions <DS:TRAN.SSFA>SSFA</> as well
as the trusted connection settings.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CLB2660 - No SHA1 signature provided from SSFA ?

  The SAP error message CLB2660: No SHA1 signature provided from SSFA typically occurs in the context of SAP's Secure Store and Forward Architecture (SSFA) when there is an issue with the digital signature of a message or document being processed. This error indicates that the system expected a SHA1 signature for the data being sent or received, but it was not provided.
  Cause:
  
  Missing Signature: The most common cause is that the data being processed does not include a SHA1 signature, which is required for validation.
  Configuration Issues: There may be misconfigurations in the SSFA settings or in the digital signature setup.
  Data Corruption: The data being transmitted may have been corrupted or altered, leading to the absence of the expected signature.
  Version Mismatch: There could be a mismatch between the versions of the components involved in the signature generation and validation process.
  
  Solution:
  
  Check Data Source: Ensure that the data being sent includes a valid SHA1 signature. If you are generating the data, make sure the signature is being created correctly.
  Configuration Review: Review the SSFA configuration settings in your SAP system. Ensure that all necessary parameters for digital signatures are correctly set up.
  Update Components: If there is a version mismatch, consider updating the relevant components of your SAP system to ensure compatibility.
  Error Handling: Implement error handling in your application to catch and log instances where a SHA1 signature is missing, allowing for easier troubleshooting in the future.
  Consult Documentation: Refer to SAP documentation or support notes related to SSFA and digital signatures for any specific guidance or updates that may address this issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the CLB2660 error. SAP frequently updates its knowledge base with solutions for common errors.
  SSFA Documentation: Review the official SAP documentation on Secure Store and Forward Architecture for detailed information on how signatures are handled and best practices for configuration.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  If the problem persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance.