Use Port Listener as a free lightweight utility to listen on the specified tcp or udp port. Great for testing "port in use" issues or port testing. This simple utility runs in your system tray and can listen on the port you specify. You can run multiple instances of the application so that you can test multiple ports in use at the same time. The port data view allows you to see what data is being sent to the port. This allows you to analyze the data and see if the transfer is correct.
We use this utlity for testing error conditions from our other software, we figured you might find it useful too.
Click here to download Port Listener
|Port Listener will only work successfully on these specific Windows operating systems: