FortiClient VPN only with Windows 11 24H2 issue?

[aqeela]

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?

[Atul_S]

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-addres...

Thanks,

[aqeela]

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

[Atul_S]

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]

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.

[Atul_S]

Hi Aqeela,

If the number 753716 rings any bell then I would suggest to work with the engineer assigned on the case as its still in progress.

Thanks,

[FortinetDF]

We have had 2 open cases with Fortigate support.   Both were closed without resolution.  They stated that we need be purchase client support in order to get help with the client.

[FortinetDF]

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]

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

[aqeela]

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