Problem with Multiplayer?

Level 3
Jan 11, 2008
I have a problem with wc3 v1.21. I have 2 comps connected together with crossover cable. So I have a small LAN with only two comps withouth the internet and withouth router or switch. If I wont to conect to the game on the second computer, it shows me only mesage: "Unable to join! Try it again."
Both the comps have the same version of wc3 with different cd-key. Firewall doesnt block it.
Another games works good, I have problem only with warcraft. Is there any solution, or need I internet solution for playing in LAN?
Sorry for my bad english.