FortiClient SSL VPN Connection keeps dropping on Windows 11 Device

[B8NDD]

Please can you help.

I have been supplied with a brand new Dell Latitude 5550 windows 11 laptop from the company I work for and I am required to connect via Forticlient VPN to the work network from home, which I can not do.  It is version 7.2.5.1053 and the VPN connection will go through the motions and ask me for a verification code and actually connect but then drops out anywhere between 30 and 60 seconds, telling me ‘SSL VPN connection is down’.

I have connected to the internet via wifi and ethernet cable.  I have tried multiple cables, ones I know are ok, with them plugged into switches and directly to my Virgin Media Hub 4 router.

My household uses multiple other devices such as windows 10 computers, imacs, ipads, smart TVs, android phones, apple phones, heating control system, which are all connected by either wifi and ethernet with no problems at all.

I have an older Dell Latitude 5500 work laptop running windows 10, which works with no problems at all and I have a stable FortiClient VPN connection all day. 

I have put the Hub into Modem Mode and successfully connected to the internet.  It looked really promising and the VPN stayed connected for the longest time so far but after about 2 minutes it would regularly drop again.

I have disabled IPv6 from all the connections but that doesn’t make a difference.

When viewing the Network Connections in the Control Panel ‘Ethernet 4’ is the ‘Fortinet SSL VPN Virtual Ethernet Adapter’.  Then when connected momentarily to the work network says the work VPN address but changes to Disabled when the connection drops.  Then if I Enable this under Network Adaptors in the Device Manager, ‘Ethernet 4’ says ‘Network cable unplugged’.  Then I might get a ‘Credential of SSLVPN configuration is wrong. (-7200)’ or it connects and drops out.  And then I am going round in circles

This is actually my second new laptop as the company IT Support couldn’t work out what was wrong and couldn’t fix this issue the first time round and so ended up giving me another laptop.  The IT guy also mentioned that circa 200 laptops of this spec and set up have been deployed with no reported problems.

Many, many thanks in advance!

[AEK]

As far as I know there were some fixes related to Windows 11 that were done on FortiClient VPN 7.4.2. Try use that version to see if it helps.

You must download it from the support portal, with a valid contract.

[MZBZ]

Please reproduce the issue and collect these logs and config files: Collecting logs for addressing VPN connec... - Fortinet Community