How do I test if a port is open and reachable on my machine?

Start Port Listener on the port you want to test. From another computer on the same network (or from the internet, if applicable), connect to your machine's IP address on that port using telnet, a browser, or any TCP client.

• If Port Listener shows the connection, the port is open and reachable
• If nothing appears, something is blocking the traffic (firewall, router, NAT, etc.)