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