Connection Timeout

[Xherdani]

Hey guys,

my brother and i bought GPBikes (2 different registr. keys) on steam. Now we wanted to play online against each other but the host (myself) gets a game crash while syncing and my brother gets a message with "connection timeout". We both have the exact same mods installed (wsbk, motogp etc.). I opened the Ports but it doesn´t work. We both play in the same house/internet ... Any solution?
THANK YOU!!