Discover what port an app is using

Question

I discovered the firewalls on the servers at a new job are turned off. It appears the previous IT person couldn't figure out what port an essential program used so he just disabled the firewall. looking at the documentation for the app it gives a range of possible ports the app might use. how can I determine the port the app is actually using?

Answer 1

You can do a

netstat -aon

then use Task Manager\Processes tab to lookup the PID to link up the process executable name to the port that's listening.

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