L2J Server

I have 3 servers running under 1 router.
2 of them are epilogue on 1 pc.
3d ir Chronicle 4 on second pc.
the problem is, I cannot connect to the C4 server (naturally, with c4 client).
I have made the necassary changes to connect, i have tested it (on a test pc without router) and it's working.
I think the problem is in ports, after all there are 2 loginservers of different versions using same port (2106 - afaik hardcoded in client), even though they are on different pcs, but forwarded through one router (external ip).
is there anything I could do to make it work, or not?

There are no messages in Epilogue loginserver console though...

if its not l2off c4 then merge them to one LS.

i'll try, but won't there be any packet issues?

im not sure, login version for sure will not match but i think other could be fine.

well it registers fine, but i can't enter the game with c4 client, only with epilogue... just as i thought
this solution doesn't work