Åben powershell og kør nedenstående kommando
tnc www.google.dk -port 25
PS C:\WINDOWS\system32> tnc 77.68.140.102 -port 26
WARNING: TCP connect to (77.68.140.102 : 26) failed
WARNING: Ping to 77.68.140.102 failed with status: TimedOut
ComputerName : 77.68.140.102
RemoteAddress : 77.68.140.102
RemotePort : 26
InterfaceAlias : Ethernet
SourceAddress : 192.168.20.91
PingSucceeded : False
PingReplyDetails (RTT) : 0 ms
TcpTestSucceeded : False
Læs mere om funktionen her