By john 
Testing whether a specific port is open on a remote host checks if a service is reachable, useful for verifying servers, connections, or firewall rules. PowerShell includes a purpose-built command for testing port connectivity in Windows 11.
The Command
Test-NetConnection -ComputerName google.com -Port 443What It Does
`Test-NetConnection` tests connectivity to the given host and, with `-Port 443`, checks whether that specific port accepts a connection. The result includes a TcpTestSucceeded line showing True if the port is reachable TANGKAS39 or False if not. Port 443 is HTTPS, so this confirms whether secure web connections to that host succeed.
When You’d Use This
This is more informative than a plain ping when you need to know whether a specific service is reachable, since it tests an actual port rather than just whether the host responds. Developers checking whether a server is accepting connections, and anyone verifying that a firewall allows a particular service, benefit from confirming that a specific port genuinely accepts connections.
Useful Variations
Change the `-Port` number to test other services, such as 80 for HTTP or 25 for mail. Without `-Port`, the command performs a general connectivity test including ping and route information. To test a local service, use the target’s IP address or name with the relevant port for that service.
If It Doesn’t Work
A False result means the port did not accept a connection, which could be the service not running, a firewall blocking it, or the host being unreachable, so it flags a problem without naming the exact cause. Test a known-open port like 443 on a major site to confirm your own connection works, then narrow down whether the issue is the target service, a firewall, or the network.
Good to Know
A False result means the port did not accept a connection, which could be due to the service not running, a firewall blocking it, or the host being unreachable, so it indicates a problem without pinpointing the exact cause. This command is more informative than a plain ping, since it tests an actual service port rather than just reachability.
Putting It Together
The command shown may look dense at first, but it breaks down into clear parts once you have used it a few times. As part of diagnosing and configuring your connection, this command belongs in your toolkit for whenever the network acts up. Used alongside the other networking commands here, it helps you methodically work from confirming basic connectivity to pinpointing exactly where a problem lies. Like anything in the terminal, the real value comes from trying it on your own system and adapting the variations above to what you actually need, so it is worth experimenting with in a safe, low-stakes situation before relying on it in a script or during troubleshooting. Keeping a note of the commands you find most useful, along with the variations that fit your workflow, turns scattered one-off tricks into a personal reference you can draw on whenever a similar task comes up again.