Question 1

What does a port checker do?

Accepted Answer

A port checker tests whether a specific TCP port is open or closed on a given host (IP or domain). If the port is open, a service is listening and accepting connections. If closed, connections are refused or timed out.

Question 2

Why would I use a port checker?

Accepted Answer

Common uses: verifying port forwarding on your router, checking if a VPN port is reachable, troubleshooting firewall rules, confirming a web or game server is accessible from the internet, and diagnosing connectivity issues.

Question 3

What does "connection refused" mean?

Accepted Answer

Connection refused means the host is reachable but no service is listening on that port. The port is closed. Check that the application is running and bound to the correct port.

Question 4

What does "connection timed out" mean?

Accepted Answer

The connection attempt did not complete within the timeout. Possible causes: a firewall blocking the port, the host is unreachable, or the service is not responding. Often indicates the port is filtered or closed.

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