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windows - tcp check command

- if telnet exists, use command:

telnet computer2know.de 443
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- if no telnet exists, use powershell and command tnc:

tnc computer2know.de -port 443

ComputerName : computer2know.de
RemoteAddress : 85.214.97.152
RemotePort : 443
InterfaceAlias : eth
SourceAddress : 192.168.17.17
TcpTestSucceeded : True
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- another command that can be used using powershell is "Test-Connection", sample:
Test-NetConnection -Port 443 -InformationLevel "Detailed" computer2know.de

ComputerName : computer2know.de
RemoteAddress : 85.214.97.152
RemotePort : 443
NameResolutionResults : 85.214.97.152
MatchingIPsecRules :
NetworkIsolationContext : Internet
IsAdmin : False
InterfaceAlias : eth
SourceAddress : 192.168.17.17
NetRoute (NextHop) : 192.168.17.1
TcpTestSucceeded : True

see also: https://learn.microsoft.com/en-us/powershell/module/nettcpip/test-netconnection?view=windowsserver2025-ps

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