Connection Problem

I made my 4.5 season server (With server files + client from somewhere around the forum) and I connect fine. But when I send the client+main to a friend for testing, they are disconnected. I gathered it's an IP-related issue, but I don't understand why, I changed every IP like I should, relating to the guide. I use a router, ports are alright, and I still cant get a person to connect.
Can someone tell me which files should I change the IP's to my local and my global IP ?
I found the thread:
http://forum.ragezone.com/f196/setup...season-753473/

Sounds like a port issue. Make sure you've forwarded all ports required & check that your firewall isn't blocking them.

Check that main ip is not local 127.0.0.1

If you have dynamic ip, use something like no-ip.

Sent from my GT-I9300 using Tapatalk 2

Thank you, will try and I'll get back to say what happened :)