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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• 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 reachable.
  Ensure the STS service is up and running on the server side.
  
  
  
  Verify SAP Configuration:
  
  In SAP NetWeaver Administrator (NWA) or SOAMANAGER, check the Web Service configuration.
  Confirm the STS URL is correctly maintained in the Web Service Security settings.
  Check the binding and endpoint settings for the Web Service.
  
  
  
  Check SSL/TLS and Certificates:
  
  If the STS uses HTTPS, ensure the SSL certificate is trusted by the SAP system.
  Import the STS server certificate into the SAP system’s SSL client PSE (Personal Security Environment).
  Check for expired or invalid certificates.
  
  
  
  Network and Firewall:
  
  Ensure no firewall or proxy is blocking the connection from SAP to the STS.
  If a proxy is used, configure the proxy settings properly in the SAP system.
  
  
  
  Authentication and Credentials:
  
  Verify that the SAP system has the correct credentials to authenticate with the STS if required.
  Check if the STS requires client certificates or other authentication methods.
  
  
  
  SAP Notes and Documentation:
  
  Check SAP Notes related to WSS018 for any known issues or patches.
  Example SAP Note: 1680110 - "Troubleshooting Security Token Service (STS) issues"
  
  
  
  
  Related Information:
  
  Security Token Service (STS): A service that issues security tokens (e.g., SAML tokens) used for authenticating and authorizing Web Service calls.
  WS-Security: A standard for securing SOAP messages, often involving tokens issued by an STS.
  SOAMANAGER: SAP transaction to configure Web Services and their security settings.
  NWA (NetWeaver Administrator): Tool to manage SAP NetWeaver components including STS.
  PSE (Personal Security Environment): Stores certificates and keys used for SSL communication in SAP.
  
  
  Summary:
  The WSS018 error indicates a failure to connect to the STS required for Web Service security token issuance. The resolution involves verifying the STS service availability, correcting configuration in SAP, ensuring SSL certificates are trusted, and checking network connectivity and authentication details.
  
  If you need further assistance, please provide details such as the SAP system version, Web Service configuration, and STS endpoint URL.