Assuming that it's a TCP (rather than UDP) port that you're trying to use: On the server itself, use netstat -an to check to see which ports are listening. From outside, just telnet host port (or telnet host:port on Unix systems) to see if the connection is refused, accepted, or . About Open Port Checker Tool. The open port checker tool allows you to check port status of your external IP address or any IP address you have entered and scan open ports on your connection. This tool is extremely useful to find out if your port forwarding is setup correct or if your server applications are blocked or not by a firewall. Open Ports on Windows XP Inside your computer. I wage a constant battle to know everything that is going on in my computer. Much of this stems from the constant barage of security holes that Microsoft calls "features" that are enabled by default in Windows XP.
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