How To Fix CM_WEB_MESSAGE_ERROR111 - ICM: Invalid Header Field

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_WEB_MESSAGE_ERROR - Message Class for CX_WEB_MESSAGE_ERROR

• Message number: 111

• Message text: ICM: Invalid Header Field

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 CM_WEB_MESSAGE_ERROR111 - ICM: Invalid Header Field ?

  The SAP error message CM_WEB_MESSAGE_ERROR111: ICM: Invalid Header Field typically occurs in the Internet Communication Manager (ICM) when there is an issue with the HTTP headers being sent or received. This can happen in various scenarios, such as when using SAP Web Application Server, SAP Gateway, or other web-based services.
  Causes:
  
  Malformed HTTP Headers: The error can occur if the HTTP headers are not formatted correctly. This could be due to special characters, incorrect syntax, or exceeding the maximum length allowed for headers.
  Proxy Issues: If there is a proxy server involved, it may be modifying the headers in a way that is not compliant with HTTP standards.
  Configuration Issues: Incorrect settings in the ICM configuration or in the web server settings can lead to this error.
  Network Issues: Problems in the network layer, such as packet loss or corruption, can also lead to invalid headers being sent or received.
  Browser or Client Issues: Sometimes, the client (browser or application) sending the request may have issues that lead to malformed headers.
  
  Solutions:
  
  Check HTTP Headers: Review the HTTP headers being sent in the request. Ensure they are correctly formatted and do not contain any invalid characters or exceed length limits.
  Review ICM Configuration: Check the ICM settings in the SAP system. Ensure that the configuration is correct and that there are no restrictions that could lead to this error.
  Proxy Configuration: If a proxy server is being used, check its configuration to ensure it is not altering the headers inappropriately.
  Network Diagnostics: Use network diagnostic tools to check for issues in the network that could be affecting the transmission of HTTP headers.
  Update SAP System: Ensure that your SAP system is up to date with the latest patches and updates, as this can resolve known issues.
  Browser/Client Testing: Test the request using different browsers or clients to see if the issue persists. This can help identify if the problem is client-specific.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues related to this error message. SAP frequently updates its knowledge base with solutions and workarounds for common problems.
  ICM Logs: Review the ICM logs for more detailed error messages that can provide additional context about the issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the problem persists after trying the above solutions, it may be necessary to engage SAP support for further assistance.