How To Fix WSS040 - Missing credential. Specify SSL client PSE used for authentication.

WSS040 - Overview

• Message type: E = Error

• Message class: WSS - Web Services Security

• Message number: 040

• Message text: Missing credential. Specify SSL client PSE used for authentication.

Self-Explanatory Message

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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 WSS040 - Missing credential. Specify SSL client PSE used for authentication. ?

  SAP Error Message:
  WSS040 Missing credential. Specify SSL client PSE used for authentication.
  
  
  Cause:
  This error occurs when an SAP system or component (such as SAP PI/PO, SAP Gateway, or Web Services runtime) tries to establish an SSL/TLS connection but cannot find the required SSL client PSE (Personal Security Environment) certificate for authentication. Essentially, the system expects a client certificate to authenticate itself to the server, but the certificate is missing or not specified.
  Common scenarios causing this error:
  
  The SSL client PSE has not been created or imported in the SAP system.
  The SSL client PSE is not assigned or configured in the relevant communication channel or service.
  The SSL client PSE is expired or invalid.
  The system configuration does not specify which PSE to use for the SSL client authentication.
  Missing or incorrect SSL configuration in the STRUST or SICF transaction.
  
  
  
  Solution:
  
  
  Create or Import SSL Client PSE:
  
  Use transaction STRUST to create or import the SSL client PSE.
  Navigate to