So my brother and I, on the same network, are trying to paly with a friend far away. The game only supports LAN/offline mode, essentially. My brother can connect to games hosted by the friend, and my brother can join games hosted by me, but I can't connect to friend's games, and he cannot connect to mine. Peer diagnosing him says we are OK and all is good, and we can all diagnose each other perfectly, as well as ping each other. But I cannot connect to games my brother or him host. Our firewalls are properly set up, as diagnosing gives us the OK. What can we do to fix this?
I'd be glad to provide more info if needed.