How To Fix SCLNT_HTTP400 - Connection to server failed (ICM_HTTP_CONNECTION_FAILED)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 400

• Message text: Connection to server failed (ICM_HTTP_CONNECTION_FAILED)

What causes this issue?

An error occurred while setting up the server connection.

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 ICM trace file.

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_HTTP400 - Connection to server failed (ICM_HTTP_CONNECTION_FAILED) ?

  The SAP error message SCLNT_HTTP400 Connection to server failed (ICM_HTTP_CONNECTION_FAILED) typically indicates that there is an issue with the HTTP connection to the server. This error can arise from various causes, and understanding these can help in troubleshooting and resolving the issue.
  Causes
  
  
  Network Issues: There may be network connectivity problems between the client and the SAP server. This could be due to firewalls, routing issues, or network outages.
  
  
  Server Configuration: The Internet Communication Manager (ICM) on the SAP server may not be configured correctly. This includes settings related to HTTP ports, SSL configurations, or other parameters.
  
  
  Service Availability: The service you are trying to access may not be running on the server. This could be due to the server being down, the service being stopped, or misconfigured.
  
  
  Client Configuration: The client application or browser may have incorrect settings, such as proxy settings or incorrect URLs.
  
  
  Resource Limitations: The server may be experiencing high load or resource limitations, causing it to reject new connections.
  
  
  SSL/TLS Issues: If you are using HTTPS, there may be issues with SSL certificates, such as expired certificates or misconfigured SSL settings.
  
  
  Solutions
  
  
  Check Network Connectivity:
  
  Use tools like ping or traceroute to check connectivity to the server.
  Ensure that firewalls or security groups are not blocking the required ports.
  
  
  
  Verify Server Status:
  
  Check if the SAP server is up and running.
  Use transaction codes like SM51 to check the status of application servers.
  
  
  
  Review ICM Configuration:
  
  Check the ICM settings in transaction RZ10 or RZ11 to ensure that the HTTP/HTTPS ports are correctly configured.
  Look for any errors in the ICM logs (transaction SMICM).
  
  
  
  Check Service Availability:
  
  Ensure that the specific service you are trying to access is active and properly configured.
  Use transaction SICF to check the status of the HTTP services.
  
  
  
  Client Configuration:
  
  Verify that the client application or browser is configured correctly, including proxy settings and the URL being accessed.
  
  
  
  Monitor Server Load:
  
  Check system performance and resource usage using transaction ST03N or SM66 to see if the server is under heavy load.
  
  
  
  SSL/TLS Configuration:
  
  If using HTTPS, check the SSL certificate validity and ensure that the server is configured to accept secure connections.
  
  
  
  Related Information
  
  ICM Logs: You can view the ICM logs in transaction SMICM to get more detailed information about the error.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to ICM or HTTP connections.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By systematically checking these areas, you should be able to identify and resolve the cause of the ICM_HTTP_CONNECTION_FAILED error.