first of all tell us what version you're trying to make work.
In-Game or Out-Of-Game? And which version number?
(Is it compatible with c3? Is it p2p?)
In out-of-game version you've got to add the ip address of the server in the file "Set.Ini".
You're lucky I'm greek too man 'cause nobody else would know what server you talk about. (l2.thegame.gr)