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be sure to update your firewall rules that have "outbound" traffic as your Wireguard's Gateway

Care to explain with a little more detail? I also have the issue, but i've already got an out firewall rule, and masquarading as the source of vpn in my setup. Thank you.

Hello There,
I am also one of those using wireguard vpn with mullvad. I had initially followed the tutorial at https://docs.opnsense.org/manual/how-tos/wireguard-client-mullvad.html

Last time I used it 2-3 days ago it worked without issue. Yesterday the wireguard connection did not work anymore. I tried changing server but It did not correct the problem. The server was up and running correctly and I could test with my phone. My opnsense version is 23.7.4.
I notice that trying to access the system/firmware/status would stall indefinitely, as if the firewall itself was trying to reach internet through the now   not working wireguard connection. I notice that my wireguard connection would create a route 0.0.0.0 and prevent the firewall from accessing internet and listing status/updating. disabling the route creation in the wireguard page would prevent that from happening. The goal here was not that the firewall itself use the wireguard connection, it was just following the tutorial as instructed to allow other clients, through nat and sock5 to reach the vpn endpoint.

So far I have been unable to fix the issue preventing wireguard from working. The netstat and diagnostics show that we can send packages, but no reply are ever received. 

-- ho I see opn69 have a fix in a different thread, I'm going to look it up. I too have some firewalling around the vpn. I hope it's not going to be too complicated, I had a hard time figure it out.