How To Fix /PF1/MSG_FH_GUI666 - Incorrect front end, or error in front end

SAP Error Message - Details

• Message type: E = Error

• Message class: /PF1/MSG_FH_GUI -

• Message number: 666

• Message text: Incorrect front end, or error in front end

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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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PF1/MSG_FH_GUI666 - Incorrect front end, or error in front end ?

  The SAP error message /PF1/MSG_FH_GUI666 Incorrect front end, or error in front end typically indicates an issue with the SAP GUI (Graphical User Interface) that is being used to connect to the SAP system. This error can arise due to various reasons, including compatibility issues, installation problems, or configuration errors.
  Causes:
  
  Incompatible SAP GUI Version: The version of the SAP GUI installed on the client machine may not be compatible with the version of the SAP system you are trying to connect to.
  Corrupted Installation: The SAP GUI installation may be corrupted or incomplete, leading to functionality issues.
  Configuration Issues: Incorrect settings in the SAP GUI configuration can lead to errors when trying to connect to the SAP system.
  Network Issues: Problems with the network connection can also cause errors in the front end.
  Missing Components: Certain required components or libraries may be missing from the SAP GUI installation.
  
  Solutions:
  
  Check Compatibility: Ensure that the version of the SAP GUI you are using is compatible with the SAP system version. You can refer to the SAP Product Availability Matrix for compatibility information.
  Reinstall SAP GUI: If the installation is suspected to be corrupted, uninstall the current version of SAP GUI and reinstall it. Make sure to download the latest version from the SAP Support Portal.
  Update SAP GUI: If you are using an older version of SAP GUI, consider updating to the latest version to resolve any known issues.
  Check Configuration Settings: Review the configuration settings in the SAP GUI. Ensure that the connection parameters (like the application server, system number, etc.) are correctly set.
  Network Troubleshooting: Check your network connection to ensure that there are no issues preventing the SAP GUI from connecting to the SAP system.
  Check for Missing Components: Ensure that all required components and libraries for SAP GUI are installed. Sometimes, additional components may be needed depending on the specific features being used.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the error message for any specific fixes or patches that may be available.
  SAP Community: The SAP Community forums can be a valuable resource for finding solutions to similar issues faced by other users.
  Documentation: Refer to the official SAP documentation for installation and configuration guidelines for SAP GUI.
  
  If the issue persists after trying the above solutions, it may be helpful to contact your SAP Basis team or SAP support for further assistance.