PowerShell · Network

Test access to a TCP port with PowerShell

Checks whether a server responds on a specific TCP port and displays useful network information.

Low risk

Command

$Serveur = "serveur.exemple.fr"
$Port = 443

Test-NetConnection -ComputerName $Serveur -Port $Port -InformationLevel Detailed

When to use it

Use this when an application, website, VPN, or remote service appears to be unreachable.

How it works

Replace the server name and port number with the target you want to test.
The TcpTestSucceeded property indicates whether the TCP connection succeeded.
The result also shows the resolved IP address and the network interface used.

Precautions

A failed test does not prove that the server is down: a firewall may be blocking the port.
Test from more than one workstation or network before drawing a conclusion.

Rollback

No rollback is required: this command does not modify the system.

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