Help Log In Problem!

Hello guys, before i make this thread, i searched a lot about my problem and although many threads were talking about it,none was able to fix it..!

So recently created an l2 interlude server using L2 Frozen and at first i begun with just Lan login but now that i finished modification and i want to put some friends to test it (kind of pre-Beta :P )

when they log in the reach until server selection and its stuck! I already configured and opened my router ports , made an no-ip , changed protocol min 1 max 999 and changed externalhostname to my no ip name! any thoughts?? Thank you in advance :D