HELP!!

SRY FOR THIS, but i got a pserver; when i run it i can connect ot db and client, the same my friends!!! But, when i modified it and gave the server to a friend i cant connect to server or db(of course, modified all the things:configs;oem...!!!)!!!!!!!!!!!!!!!!!!!!
He can connect to game! I cant, but I modified the files!!!!
Now, why people cant connect to the server??? Does the switch(router) afect something???????????????????????????

maybe ur friends server now doesnt have the right ips in config.ini or shell.ini

or may be if its using hamtchi to connet u need to make a new network from ur hosters computer cannot use the one u had before ok ?? or just delete the network frm ya house and make the same one in ur hosters house ok ?

man, the ini files are corect, i modified the files for his ip!! Next, he doesnt use hamachi!

then make sure he has the ports he needs forwarded set up to forward otherwise your screwed