Help With Connection Issues?

[MasterGrog]

ok well after a day of playing around, i have the server up and running. people can connect,except one friend from the Uk no matter what we do he cant connect,ive already forwarded all the ports,firewalls ect... ran the server test and it all checks out,he also tries to run a server and it all checks out and i cant connect to him either,he also has forwarded all of his ports ect...and shut off firewalls,and both servers show up on the weblist
seems hes the only one who cant connect to my server,anyone have any ideas at all? ive gone as far as to shut off all my firewalls aswell,even know i know everyone else connects fine so its not likely the firewall,hes running Vista and im on xp pro,we tried running his ts in Adminstator mode and in xp mode nothing works,
so if anyone has somthing im missing let me know plz
like i said hes the only one who cant connect and server shows on his weblist lol its messed up

[BHKai]

Ask him to perform a trace route to your server.

Vista does not have the run command avaiable by default on the Start menu. So you can just use the window key and R to get to the run command.

Start>run>cmd>tracert <server ip only, no port number>

[MasterGrog]

ya we did that it drops at like 17 count,not like i even know what it means but after that its like 17through xxx all timed out,its weird hes only one who cant connect,on the other hand he can connect to other random servers in the weblist as can i but he cant connect to me and i cant to him either i still think its his damn Vista!!!!!any ideas?and he does have wireless net too so that might be it,but he still connects to others so

[BHKai]

Does he have a high ping to your server?

If he is connected wirelessly it could be a problem of high ping and lossing packets from wireless.

Do you have anyone else from the UK that can not connect.

I have a Vista Ultimate 64 and Vista Business 32 if you want me to try to connect to see if it is a Vista Problem.