I can play but

I can play but my friends can't connect to the server, they see the server but cannot connect... please help.

unpack ur system.mrs and then edit the xml file called system.xml

after that edit the ip in the system.xml

No shit really.. I already did thats why the server shows for them but they cannot connect to it.

There must something wrong with IP's Check Post your INI configuration here so we can see you problem ;)

Also tell them to turn off firewall, Or, if they are smart enough, tell them to by pass is trough the firewall.