Site to Site VPN - Connected but 0.00 KB/s download speed

I have a Flint 2 router connected to my home ISP provided router, the Flint 2 is acting as the WireGuard VPN Server.

I have A BerylAX travel router that is mobile tethered (Just to test) with a WireGuard client configured and connected to the Flint2 VPN Server fine. As per below.

However, when the VPN is active I get 0.00 MB/s download speed and barely any upload either. The traffic seem's ok.

What is causing this?

Thank you,

Please check all points mentioned in this thread: How to troubleshoot WireGuard

I think it may be this? How do I check this? Wireguard VPN Server not working. Client Connecting, but nothing loads, OpenVPN works fine

Did you test all the other things mentioned in my link above?
No network is the same on each side?

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Yes, the only thing I could think of was the mobile tethering/starlink part you mentioned but mine is tethered on the client side just to test? So this wouldn’t be causing the 0.00kb/s download speed would it?

Any idea’s?

Thank you

WireGuard does not have a real "connection control" - so even if the connection can't be (really) established, it will show connected.

Maybe the issue is on the server side. Is it working if you use phone app wireguard to connect?
Make sure the server interface has a network prefix other than 32.