Could you get him to open Windows PowerShell (type PowerShell at the start menu) and in the window type and enter
Test-NetConnection peerchat.server.cnc-online.net -port 6667Then post the output in here.
Done:
ComputerName : peerchat.server.cnc-online.net
RemoteAddress : 185.17.144.132
RemotePort : 6667
InterfaceAlias : Ethernet
SourceAddress : 10.150.109.128
TcpTestSucceeded : True