How To Fix ICM031 - HTTP subhandlers could not be read (rc=&1)

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 031

• Message text: HTTP subhandlers could not be read (rc=&1)

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 ICM031 - HTTP subhandlers could not be read (rc=&1) ?

  The SAP error message "ICM031 HTTP subhandlers could not be read (rc=&1)" typically indicates an issue with the Internet Communication Manager (ICM) in the SAP system. This error can occur due to various reasons, including configuration issues, missing components, or problems with the HTTP server settings.
  Causes:
  
  Configuration Issues: Incorrect settings in the ICM configuration can lead to this error. This includes issues in the profile parameters related to ICM.
  Missing or Corrupted Files: The necessary files or components required for the ICM to function properly may be missing or corrupted.
  Network Issues: Problems with network connectivity or firewall settings can prevent the ICM from accessing required resources.
  Resource Limitations: Insufficient system resources (like memory or CPU) can also lead to this error.
  Version Compatibility: Incompatibility between different components of the SAP system or between the SAP system and the underlying operating system.
  
  Solutions:
  
  
  Check ICM Configuration:
  
  Review the ICM settings in the instance profile (e.g., icm/server_port_0).
  Ensure that the HTTP ports are correctly configured and not conflicting with other services.
  
  
  
  Check for Missing Files:
  
  Verify that all necessary files for the ICM are present and not corrupted. This may involve checking the installation directory and ensuring that all components are correctly installed.
  
  
  
  Review System Logs:
  
  Check the SAP system logs (transaction SM21) and the ICM logs (transaction SMICM) for more detailed error messages that can provide additional context.
  
  
  
  Restart ICM:
  
  Sometimes, simply restarting the ICM can resolve transient issues. You can do this through transaction SMICM by selecting "Restart ICM".
  
  
  
  Check Network Configuration:
  
  Ensure that there are no network issues preventing the ICM from functioning correctly. This includes checking firewall settings and ensuring that the necessary ports are open.
  
  
  
  Monitor System Resources:
  
  Use transaction ST02 (buffer management) and ST06 (OS monitoring) to check for resource bottlenecks. If the system is low on resources, consider increasing the available memory or CPU.
  
  
  
  Update SAP Kernel:
  
  If the issue persists, consider updating the SAP kernel to the latest version, as this may resolve compatibility issues.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  SMICM: Internet Communication Manager
  SM21: System Log
  ST02: Buffer Management
  ST06: Operating System Monitor
  
  
  SAP Support: If the issue cannot be resolved with the above steps, consider reaching out to SAP Support for further assistance.
  
  By following these steps, you should be able to diagnose and potentially resolve the "ICM031 HTTP subhandlers could not be read" error in your SAP system.