I have the same problem : #1237829606443057193 message
I tried to work around the force ip / force bind but I tried the firewall fixer but nothing works....
I use port forwarding, I host the server and I did set up my firewall but maybe I did something wrong ?
My mate can host games, I can too, but we can't join each other but we can see the other player server running, we just have the "Unable to connect....." message whenever we try to connect