DIABLO 2 playing problems, who has experience with playing on LAN?

I'm playing the copied version which was patched with GameCopyWorld fixes up to version 1.03.

I already knew that playing via the internet was a problem, but palying the game via a LAN should in my opinion not be a problem.

But whenever I try to join a game on one of the other pc's to a game that I hosted on the main PC, it says that it cannot find the server. Which should not be a problem because I can ping the other pc and also "see" it in my Network neighbourhood window.

Who help me out?