How To Fix CM_WEB_MESSAGE_ERROR108 - ICM: Invalid Header

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_WEB_MESSAGE_ERROR - Message Class for CX_WEB_MESSAGE_ERROR

• Message number: 108

• Message text: ICM: Invalid Header

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CM_WEB_MESSAGE_ERROR108 - ICM: Invalid Header ?

  The SAP error message CM_WEB_MESSAGE_ERROR108 ICM: Invalid Header typically indicates an issue with the Internet Communication Manager (ICM) in the SAP system. This error can occur due to various reasons, often related to HTTP headers or communication settings. Here’s a breakdown of potential causes, solutions, and related information:
  Causes:
  
  Malformed HTTP Headers: The error may arise if the HTTP headers sent by the client or received by the server are not formatted correctly.
  Proxy Issues: If there is a proxy server involved, it might be altering the headers in a way that the ICM cannot process them.
  Configuration Issues: Incorrect settings in the ICM configuration or the web dispatcher can lead to this error.
  Network Issues: Problems in the network layer, such as dropped packets or timeouts, can also result in invalid headers.
  Browser Issues: Sometimes, the client-side (browser) can send unexpected headers due to extensions or misconfigurations.
  
  Solutions:
  
  Check HTTP Headers: Use tools like browser developer tools or network monitoring tools (e.g., Fiddler, Wireshark) to inspect the HTTP headers being sent and received. Look for any malformed or unexpected headers.
  Review ICM Configuration: Check the ICM settings in the SAP system. Ensure that the parameters are correctly set. You can do this using transaction code RZ10 or RZ11.
  Check Proxy Settings: If a proxy is being used, verify its configuration. Ensure that it is not modifying the headers inappropriately.
  Update SAP Kernel: Sometimes, bugs in the SAP kernel can cause issues. Ensure that you are running a supported and updated version of the SAP kernel.
  Browser Cache and Cookies: Clear the browser cache and cookies, or try accessing the application in a different browser or in incognito mode to rule out client-side issues.
  Network Configuration: Check for any network devices (firewalls, load balancers) that might be interfering with the HTTP traffic. Ensure they are configured correctly.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that might address this specific error. There may be patches or updates available.
  
  Related Information:
  
  ICM Logs: Check the ICM logs for more detailed error messages. You can find these logs in the transaction SMICM under the "Log File" section.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they found effective.
  Documentation: Review the official SAP documentation regarding ICM and HTTP communication for best practices and troubleshooting steps.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with detailed logs and error messages for a more in-depth analysis.