[GTLS]

Make sure you have Announce and Lanmode to 1 in server.cfg file. if you are away from each other and cant connect to LAN, you have to portforward your internet. Visit portforward.com and read its easy guide. you can also use Hamachi to connect through LAN even if you are away. but i suggest you port forward. cuz Hamachi needs too much Internet and it even lags game.

After Portforwarding, go to whatsmyip.org and give that IP to your friends along with your port and they will be able to connect.