How To Fix SCLNT_HTTP416 - Logon at proxy failed (ICM_HTTP_PROXY_UNAUTHORIZED)

SAP Error Message - Details

• Message type: E = Error

• Message class: SCLNT_HTTP - Messages for HTTP Client for Respective Error Code

• Message number: 416

• Message text: Logon at proxy failed (ICM_HTTP_PROXY_UNAUTHORIZED)

What causes this issue?

The logon at the proxy server has failed.

System Response

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

How to fix this error?

Check the proxy logon data.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SCLNT_HTTP416 - Logon at proxy failed (ICM_HTTP_PROXY_UNAUTHORIZED) ?

  The SAP error message SCLNT_HTTP416 with the description "Logon at proxy failed (ICM_HTTP_PROXY_UNAUTHORIZED)" typically indicates that there is an issue with authentication when trying to connect to a proxy server. This error can occur in scenarios where SAP systems are configured to use a proxy for outbound HTTP(S) connections, and the credentials provided for the proxy are either missing, incorrect, or not accepted by the proxy server.
  Causes:
  
  Incorrect Proxy Credentials: The username or password configured for the proxy might be incorrect.
  Missing Proxy Credentials: The system may not have the necessary credentials configured to authenticate with the proxy.
  Proxy Configuration Issues: The proxy server itself may have configuration issues or may be down.
  Network Issues: There could be network connectivity issues preventing the SAP system from reaching the proxy server.
  Authorization Issues: The user account being used may not have the necessary permissions to access the proxy.
  
  Solutions:
  
  
  Check Proxy Configuration:
  
  Go to the SAP system's transaction code SICF and check the configuration for the HTTP service.
  Ensure that the proxy settings are correctly configured in the SAP system.
  
  
  
  Verify Credentials:
  
  Check the credentials (username and password) configured for the proxy in the SAP system.
  You can find these settings in transaction SMICM under the "HTTP" tab, then "Proxy Settings".
  
  
  
  Test Proxy Connection:
  
  Use a tool like curl or a web browser to test the proxy connection manually with the same credentials to ensure they are valid.
  
  
  
  Update Credentials:
  
  If the credentials have changed, update them in the SAP system.
  You can do this in transaction SMICM by navigating to the "Proxy Settings" and entering the correct username and password.
  
  
  
  Check Proxy Server Status:
  
  Ensure that the proxy server is up and running and that there are no issues on the server side.
  
  
  
  Network Troubleshooting:
  
  Check for any network issues that might be preventing the SAP system from reaching the proxy server.
  Use tools like ping or traceroute to diagnose connectivity issues.
  
  
  
  Review Logs:
  
  Check the SAP system logs (transaction SM21) and the ICM logs for more detailed error messages that might provide additional context.
  
  
  
  Consult Documentation:
  
  Refer to SAP Notes or documentation related to proxy configuration and authentication for any specific guidance or updates.
  
  
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  ICM Configuration: Familiarize yourself with the Internet Communication Manager (ICM) settings in SAP, as they play a crucial role in handling HTTP(S) requests and proxy configurations.
  Security Policies: Ensure that any security policies in place (e.g., firewall rules, proxy server settings) allow the SAP system to authenticate and connect to the proxy.
  
  By following these steps, you should be able to diagnose and resolve the SCLNT_HTTP416 error in your SAP system.