Internal Login Problem

[elmarkivo]

Hi, i am running the Server On Debian x64.
i have no problems with players over the internet but i can´t connect on the LAN.
i pass the login window but i cannot enter to gameserver.
i have a firewall in the middle but all the traffic over LAN is allowed..

i don't know what is the problem and i don't know where i can keep looking for it.

Thanks in advance.