everything is ok with my ports.
i have a local LAN server runned on some local comp (ip=X.X.X.X) with default port and no restrictions on the ports.
when i run following command at another computer:
"lfs.exe /join=X.X.X.X"
lfs runs fine but it do not join the LAN server.
instead it tryes to find server named "X.X.X.X" on the master server, and there is no such one.