I Have A Big Dilemma!

[oasys321]

Ok i have a big problem i need help and if u can solve this for me i will practically worship you!!!
Ok, my problem is that i have made my server and i can login, but my friends have downloaded the client and they cant log in and play with me. I need help ASAP plz help meeeeee! :49:

[MentaL]

[Mambo]

What is the exact problem?
Add me on msn: RestyleMSN@live.nl
I will help you out if i can;)

[Huskyhond]

Ehh post your error?