L2J Server

I made a server and i was following many guides, but i didn't see any solution for my problem. Please help me!
So, i can log into my server if i connect from the same computer on which the servers are running. If i try to connect from another computer (and from another network) using the first computer's hosts, it says: Wait til i log in... or something like this, but i can wait for thousand years but it will not log in. I have tried to vary the hosts lines and looked on many forums and guides, but still unable to connect. What could be my problem?
If you need any information, i can provide, just tell me...

probably problems w/ opening ports for people / network to connect, but should try searching more, these topics are everywhere

1) beware of 10.x.x.x or 192.168.x.x addresses, these are restricted for Local network and many routers will drop them. 127.x.x.x is even worse as it's a loopback to your own computer

2) check your routing tables. Both computers (your server and the host) should be able to be reached by each other (ping ?)

3) if planning to get connexions from internet, your server must NOT be on a NAT.

4) check that ports are open on your firewall...