Metal gear solid peace walker

[tf2neer]

Hi, didn't know exactly where to post this but I need help regarding playing co-op in Peace Walker.
Me and my friend use Evolve to make a party and host/join our games. I use adHoc server to host and he can just join through my IP. The problem is that he gets a "connection lost" message after 2 seconds of getting into my lobby.
Only once we've succeded in starting a mission in time before letting the lobby get unstable for him. The gameplay works perfectly fine, no lag... but in the lobby he often gets disconnected so we're struggling.

Any help would be really appreciated, and I thank you guys for making such an awesome emulator, just this particular problem is preventing me to play online.