How To Fix WSS018 - No connection to the Security Token Service of this Web Service found.

SAP Error Message - Details

• Message type: E = Error

• Message class: WSS - Web Services Security

• Message number: 018

• Message text: No connection to the Security Token Service of this Web Service found.

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 WSS018 - No connection to the Security Token Service of this Web Service found. ?

  SAP Error Message:
  WSS018 No connection to the Security Token Service of this Web Service found.
  
  
  Cause:
  This error occurs when the SAP system tries to communicate with the Security Token Service (STS) for a Web Service but fails to establish a connection. The STS is responsible for issuing security tokens used in WS-Security scenarios (e.g., SAML tokens for authentication). The failure can be due to:
  
  The STS service is not running or is unreachable (network issues, wrong URL).
  Incorrect or missing configuration of the STS endpoint in the SAP system.
  SSL/TLS issues (certificate problems, untrusted certificates).
  Proxy or firewall blocking the connection.
  Incorrect or missing authentication credentials for the STS.
  The Web Service configuration does not point to a valid or active STS.
  
  
  
  Solution:
  To resolve the WSS018 error, follow these steps:
  
  
  Check STS Service Availability:
  
  Verify that the STS endpoint URL configured in the SAP system is correct.
  Test the STS URL externally (e.g., via browser or curl) to ensure it is