What ports are being used and by what programs?

Sometimes you might need/want to know what ports on your machine are being used.

If you try to start up a process listening on some port and it reports that the port is alread in use, what do you do?

The answer is to use this command:

netstat -a -n -o

This will show you all port activity including the PID so you can open up task manager and find which process is using which port.


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