How to Test the Computer Port
A computer "port" is a hole in the computer's firewall that can be used to receive or transmit data. Testing a port can be necessary when you are unsure whether it is open or closed. Testing a port sends a small amount of data to the indicated location, allowing you to know whether it is reaching the computer in question. This can generally be done in minutes.
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Instructions
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Click "Start" and type "cmd" in the "Search" box.
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Press "Enter" to display a DOS prompt.
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Type "ping ipaddress:port" and press "Enter," replacing "ipaddress" with the IP of the computer being tested and "port" with the number of the port being tested.
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Repeat as needed to test alternate ports.
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