How To Fix WSS101 - HTTP communication error

SAP Error Message - Details

• Message type: E = Error

• Message class: WSS - Web Services Security

• Message number: 101

• Message text: HTTP communication error

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WSS101 - HTTP communication error ?

  SAP Error Message:
  
  WSS101 HTTP communication error
  
  Cause:
  The error message WSS101 HTTP communication error typically occurs when there is a problem in the HTTP communication between SAP and an external web service or system. This can be due to several reasons such as:
  
  Network connectivity issues (e.g., firewall blocking, DNS resolution failure).
  Incorrect URL or endpoint configuration in the SAP system.
  SSL/TLS handshake failures (certificate issues, protocol mismatches).
  Authentication failures (wrong credentials or missing authorization).
  Proxy server misconfiguration.
  The external web service is down or unreachable.
  HTTP protocol errors (e.g., 404 Not Found, 500 Internal Server Error).
  
  
  Solution:
  To resolve the WSS101 HTTP communication error, follow these steps:
  
  
  Check Network Connectivity:
  
  Verify that the SAP server can reach the external web service URL using tools like ping, traceroute, or telnet on the relevant port.
  Ensure no firewall or proxy is blocking the connection.
  
  
  
  Verify URL and Endpoint:
  
  Confirm that the URL configured in the SAP system (e.g., in SOAMANAGER or the relevant RFC destination) is correct and accessible.
  Test the URL in a browser or with tools like curl or Postman.
  
  
  
  Check SSL/TLS Settings:
  
  If HTTPS is used, ensure that the SSL certificates are correctly imported into the SAP system’s SSL client PSE.
  Check for expired or invalid certificates.
  Verify that the SSL protocol versions supported by SAP and the external service are compatible.
  
  
  
  Authentication and Authorization:
  
  Confirm that the credentials (username/password, tokens) used for the HTTP call are correct.
  Check if any additional headers or tokens are required.
  
  
  
  Proxy Configuration:
  
  If a proxy server is used, verify the proxy settings in SAP (transaction SM59 for HTTP destinations).
  Ensure the proxy allows the connection to the target URL.
  
  
  
  Check SAP Logs and Traces:
  
  Use transaction SMICM to check the ICM trace.
  Use transaction ST22 for any related dumps.
  Check the HTTP log in transaction SM59 (for HTTP destinations) or SOAMANAGER logs.
  
  
  
  External Service Status:
  
  Confirm that the external web service is up and running.
  Check for any maintenance or downtime.
  
  
  
  
  Related Information:
  
  
  Transactions to check/configure:
  
  SOAMANAGER — Web Service Configuration.
  SM59 — RFC Destinations (HTTP connections).
  SMICM — Internet Communication Manager monitoring.
  STRUST — SSL certificate management.
  ST22 — ABAP runtime errors.
  SM21 — System log.
  
  
  
  SAP Notes:
  
  Search for SAP Notes related to WSS101 or HTTP communication errors for specific patches or known issues.
  
  
  
  Common scenarios:
  
  Calling external SOAP or REST web services from SAP.
  Integration scenarios using SAP PI/PO or SAP Cloud Platform.
  SAP Gateway or SAP CPI communication errors.
  
  
  
  
  Summary:
  WSS101 HTTP communication error indicates a failure in HTTP communication between SAP and an external system. The root cause is often network, configuration, SSL, or authentication related. Troubleshooting involves verifying connectivity, endpoint correctness, SSL certificates, credentials, proxy settings, and external service availability.
  
  If you provide more context (e.g., where the error occurs, logs, system setup), I can help with more targeted troubleshooting steps.