Forticlient VPN kills internet connection on Linux

[matheushfreis]

I'm doing an exchange program and I use Forticlient VPN to connect to the network of the institution where I study in my home country. It works normally on my laptop with a Windows OS, but when I use it on the computer in the lab, which is Linux, it doesn't work. I don't think the problem is the network or that I'm in a different country because I use the same network with my laptop.

We formatted the lab's computer so that I could use it and installed the Kubuntu 22.04 LTS distribution. I installed Forticlient VPN, and when i tried to connect to the network it wouldn't leave the “connecting” status. I searched on the internet and saw that other people also had problems with this Linux distribution to connect to Forticlient VPN and that possibly the problem was the Kubuntu uses KDE.

We formatted the computer again, this time using Linux Mint 21.3 (Virginia) and with that I was able to connect to the network but I can't browse the internet. The measurements are 0.4 Kb sent and 0.0 Kb received. As soon I disconnect the VPN, I can browse normally again.

Anyone had the same problem and/or know how to solve this?

[aseques]

If you don't need SAML, you can use openfortigui (an opensource client for fortigate vpn) that always has worked as expected for me.

If you neet do use the VPN client from forticlient I'd recommend that you stuck on version 7.4.0.1636 because the version 7.4.1.1697 seems to have issues (for example not loading the routes from the remote)

[matheushfreis]

Actually I need the SAML, but I could resolve the problem as I explained in the other reply. Thanks for your contribution!!

[matheushfreis · Accepted solution]

After some searching and consulting some friends, I resolved the problem.
To do so, I:

* Upgraded my OS to Kubuntu 24.04;

* Installed the Forticlient VPN following the tutorial in https://www.youtube.com/watch?v=WMZKicLzcV0

* Uncomment the line of DNS in the file /etc/systemd/resolved.conf and added the DNS of CloudFlare (it could be the Google one too - 8.8.8.8). So it would be like:

         DNS = 1.1.1.1 1.0.0.1