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aqeela
aqeela
Visitor III
October 10, 2024
Question

FortiClient VPN only with Windows 11 24H2 issue?

  • October 10, 2024
  • 10 replies
  • 39376 views

Anyone experienced issues with FortiClient VPN not working on Windows 11 24H2? I have no issues on Windows 11 23H2. I've tried various versions with no luck connecting with stability. There is a lag once reaching 95-98%, hangs, then connects but disconnects immediately after. So far rolling back windows 11 23h2 is only fix so far. 

 

PS. Foritnet support has denied of any issues with windows 11 24h2.

 

Current FortiClient 7.2.4

 

Any suggestions?

 

 

    10 replies

    Atul_S
    Staff & Editor
    Atul_S
    Staff & Editor
    October 10, 2024

    Hi Aqeela,

     

    Gday. Please try delete the update file KB2693643 using the link below and see if this resolves your problem.

     

    https://community.fortinet.com/t5/FortiClient/Troubleshooting-Tip-VPN-SSL-connected-but-no-IP-address-in/ta-p/248143

     

    Thanks,

    aqeela
    aqeelaAuthor
    Visitor III
    October 10, 2024

    Correct, I did stumble across this article.  In my case, I did not have this KB on any of the impacted machines.

    Atul_S
    Staff & Editor
    Atul_S
    Staff & Editor
    October 10, 2024

    Hi,

     

    In that case, for testing purposes on one machine, do you mind upgrading FCT to 7.2.5 and note down the behavior? This will help understand if the issue is specific to one particular version or the 7.2 train itself. 

     

    Do you mind providing the old ticket number you raised with the TAC so that I can see some relevant info you may have already shared there and this way I wont be bothering you too much asking for info. 

     

    Are you using EDR and EMS?

     

    Thanks,

    aqeela
    aqeelaAuthor
    Visitor III
    October 10, 2024

    I have not tried 7.2.5 but I did latest release from FortiClient available on the site which is 7.4. I had similar issue.

     

    As for ticket I opened a case with our NOC, Masergy’s who escalated the issue to Fortinet.

    FortinetDF
    FortinetDF
    New Member
    October 11, 2024

    I'm having the same issue.   I called support and they were not able to help me.   It's only on our 24H2 machines.

    FortinetDF
    FortinetDF
    New Member
    October 11, 2024

    We discovered some more information today.   It seems to be a conflict between 24H2, Sentinel One and the Fortigate Client.

     

    aqeela
    aqeelaAuthor
    Visitor III
    October 11, 2024

    Okay, great. Please update the thread when you have any further update.

    FortinetDF
    FortinetDF
    New Member
    October 11, 2024

    Are you guys running S1 as well?

    aqeela
    aqeelaAuthor
    Visitor III
    October 11, 2024

    Yes we are running S1 as well version 23.3.3.264

    FortinetDF
    FortinetDF
    New Member
    October 11, 2024

    We spoke to S1 and they asked us to upgrade the S1 Client (We were on the same version as you)

    We upgraded to version 24.1.4.257 and that appears to have resolved the issue.

    aqeela
    aqeelaAuthor
    Visitor III
    October 11, 2024

    We just started rolling out this version on select machines. I will attempt S1 24.1.4.257 on Windows 11 24H2. Thank you for the insight.

    INT1
    INT1
    Explorer
    October 14, 2024

    what i would advice is use the latest version of forticlient download vs C++ 2015-2022 redistributable 

    after that mke sure that there is no saving for the SSO in the credentials manager windows credentials, if there is any saving make sure to delete it and try again to connect.

    ericackermans
    ericackermans
    New Member
    October 22, 2024

    Same problem experienced. Solved it today by installing the latest MS Visual C++ Redist. Available at: https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist

    FRoGito
    FRoGito
    New Member
    October 25, 2024

    Yep, same stability issue here since the W11 24H2 upgrade... Seems more stable over RJ45 than Wi-Fi, but even when it gets stable [which is pretty rare] I often have DNS issues then.

    MrBombastic
    MrBombastic
    New Member
    December 26, 2024

    Hello,

     

    We also had this issue, only with Windows 11 version 24H2 (previous versions worked fine).

    The solution we found was installing forticlient version 7.0.2.0090 - it worked for us on multiple computers.

     

    Hopefully it helps...

    owen911
    owen911
    Visitor III
    March 20, 2025

    running FortiClient 7.4.2 with win 11 24H2
    works fine.
    try for a upgrade?

    sistemastrinyrental
    sistemastrinyrental
    New Member
    March 24, 2026

    La version de FortiClient 7.4.2, con Windows  11 25H2 Home si me funciono y ademas desinstale las microsoft visual C++ 2015 22 Redistribuible 64(86), luego de instalar   configure estas opciones segun el link en (imgur.com/a/ipsec-tunnels-issues-with-forticlient-w11-24h2-TwO9C8P)

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