I use a DreamPi to go online, and I've successfully created an account and entered the lobby. I received a challenge from user "Dennjo" and I accepted it, then it goes into the game screen and for 30 seconds it says "Synchronizing with remote player; get ready to play". However, this timed out ("Failed to synchronize with opponent") and we were thrown back to the account selection screen. We tried again, but same result. It also happened with a user "DreamcastUK", so I assume the issue is on my end.
Port 3512 TCP and UDP is forwarded on my router like the guide recommends, and MTU is set to 1400. I have successfully played a other games online with this setup (PSO, Quake).
Anybody had this issue or know how to fix it?