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Darien18
Darien18
Explorer
December 31, 2025
Question

FortiClient will not start

  • December 31, 2025
  • 3 replies
  • 598 views

In recent days, we have received tickets from users reporting that FortiClient is not running on their computers. The symptom is that when the FortiClient icon is selected, a blank window opens and immediately closes. When run again, it does nothing. In the task manager, the FortiClient process was visible but did not perform any action.

 

This has already occurred on four computers, and as a reactive measure, FortiClient was uninstalled and reinstalled. This occurred on computers running versions 7.4.3 and 7.4.5.

 

I am writing in this forum to ask about a possible solution to this problem in case it becomes widespread and to find out if it has happened to anyone else.

 

In the release notes, there is a bug with ID 1226762 that is very similar to the case I am presenting, however, we do not have computers with AMR64 Windows.

 

 

3 replies

Jean-Philippe_P
Staff & Editor
Jean-Philippe_P
Staff & Editor
January 5, 2026

Hello Darien18, 

 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

Jean-Philippe - Fortinet Community Team
Jean-Philippe_P
Staff & Editor
Jean-Philippe_P
Staff & Editor
January 5, 2026

Hello again Darien18,

 

I found this solution. Can you tell us if it helps, please?

 

The issue you're experiencing with FortiClient showing a blank window and closing immediately could be related to a known bug or a different underlying issue. Here are some steps you can take to troubleshoot and potentially resolve the problem:

 

  1. Check for Known Issues: Review the release notes for FortiClient versions 7.4.3 and 7.4.5 to see if there are any known issues similar to what you're experiencing. Although you mentioned Bug ID 1226762, ensure there are no other related issues.

  2. Update FortiClient: Ensure that you are using the latest version of FortiClient. Sometimes, newer versions contain fixes for bugs present in previous releases.

  3. Check System Compatibility: Verify that the affected computers meet the system requirements for the FortiClient version being used.

  4. Review Event Logs: Check the Windows Event Viewer for any error messages or logs related to FortiClient. This might provide more insight into what is causing the issue.

  5. Reinstall FortiClient: As a temporary measure, uninstalling and reinstalling FortiClient can sometimes resolve the issue. Ensure that you completely remove all FortiClient files and registry entries before reinstalling.

  6. Contact Fortinet Support: If the issue persists, consider reaching out to Fortinet Support for further assistance. They may have additional insights or a patch available for the issue.

  7. Monitor for Patterns: Keep track of any patterns or commonalities among the affected computers, such as specific software configurations or recent updates, which might help identify the root cause.

If none of these steps resolve the issue, it may be beneficial to escalate the problem to Fortinet Support for a more in-depth investigation.

Jean-Philippe - Fortinet Community Team
    AEK
    SuperUser
    AEK
    SuperUser
    January 5, 2026

    Try check if you can find any relevant log in the Windows event logs or in the FortiClient logs.

    AEK
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