Heroes III MP problem.

[Savage]

I have the following problem: Here we have 2 PC's connected in lan network.One of the PC's is main in the network,the second is sub.Hosted games (HMM 3 SoD) on the main pc are seen on the sub, but when i try to connect , it says "Sorry,there was an error connecting to that session.Please try again." Well yeah,but no matter how many times i try,its the same.Can anyone help me sort this thing out?