Disconnects with Windows 11 PC / 5G Router

[r4ndom81]

Hi,
i'm using Forticlient VPN  now since approx 1.5 years for work, without any problems.
Usually i connect over a DSL Line with a LAN-Cable connected to my Windows 10 PC.
Sometimes, due to provider problems, i also use a Mobile Data Card, which is operating in a 5G Router. It provides a Wifi net, which my W10 PC connects to and Forticlient also runs smoothly.

Recently, i got a second machine with Windows 11 installed. Over the "normal" house-Wifi everything also works but when i try to use the same 5G Router connection, which is still working on my Windows 10 machine, Forticlient connects and then always immediately disconnects. Tried also to connect the 5G Router with a cable, but same effect...

Maybe someone knows this kind of preoblems and may help. Would appreciate :)

Cheers

[r4ndom81]

And i did the route print command in the prompt window, when disbaling IPv6, but the data gives me no clue whats going on, sorry, again, no administrator or specialist :)

[AEK]

When you type "route print" do you see a default gateway through the tunnel?

[r4ndom81]

Ive the results in front of me but where do i find the default gateway info?
Got an Interface table, a IPv4 Route Table and a IPv6 Route table...

[r4ndom81]

IPv6 is disabeled btw for this test now.

[AEK]

Disable IPv6 and initiate the SSL VPN connection, then run route print.

The defaut gateway is the line that starts with 0.0.0.0.

You may have multiple lines starting with 0.0.0.0. Do you see one of the default routes going through the tunnel?

[r4ndom81]

The first line of the IPv4 Rout table/Active Routes starts with 0.0.0.0. (Network destination) and has the Gateway 192.168.0.1
Is this info helpfull?

[AEK]

If this is the unique 0.0.0.0 entry you have then you have one single default gateway through your 5G modem.

Try share the routing table so we can give a better help. If there is any confidential info (like a public IP) then you can blur it before sharing.

[r4ndom81]

No, there are 2x 0.0.0.0. entries at the top of the IPv4 route table.

Mhhh,  what are possible public IPs or confidential infos in the print? Sorry, but would prefer to not post the full screenshot because there are strict NDAs in place, given from my employer and i dont want to post sensible informations in any way. Thing is i dont know what may be confidential and what not...again sorry, even if i have to decline some helpful infos here :\

[r4ndom81]

And doublechecked on my WORKING other Windows PC: the rpmpt print gives the same infos with the two 0.0.0.0 entries at the top...plus some more entries on the IPv6 tabel (cause its enabled there).

[AEK]

Since there is no routing mismatch between the two clients, can you check if any difference in the NIC driver/version or NIC configuration? I mean the network adapter connected to your router.