Use Netstat to check if a port is listening

I should have put this handy long time ago.  There is situation that we need to know if a special port on a server is listening, then we can see if need to open firewall, etc.  So the command netstat is our friend.

Simple way to use netstat is:

>netstat –ano | more

It will show all the listening ports in numerical form, and the process ID that is listening.

Another way is use find:

>netstat –an | find “:3389”
TCP               LISTENING

I will add some Linux command later.