Windows Network Checks

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Purpose: Test TCP reachability from a Windows host when source position or available tooling matters.

Test one TCP port from the Windows source host:

Test-NetConnection -ComputerName TARGET -Port PORTS

Read: TcpTestSucceeded, source and destination addresses. Use one number for PORTS. Failure does not distinguish a closed port, filtering or a path problem.

Variants — scan ports 1-1024 or a selected port list

Scan a low-port range

1..1024 | % {echo ((New-Object Net.Sockets.TcpClient).Connect("DC_IP", $_)) "TCP port $_ is open"} 2>$null

Check a selected port list

The example list can be changed to the endpoints of interest.

22,80,443,445,3389 | % {echo ((New-Object Net.Sockets.TcpClient).Connect("TARGET", $_)) "TCP port $_ is open"} 2>$null

$_ is the current port; errors are hidden. No printed result does not prove every port is closed. Results reflect the Windows host's access and the stated port selection.