See what process is using a TCP port in Windows Server 2008

We were trying to track down what port a license manager was using because?the?clients couldn’t connect to checkout a?license. The Application owner did not know and didn’t have support on the product 🙂

So I whipped out the handy little command line netstat

netstat -nab

will give you a list of all connections and listening ports as well as the executable responsible for the open port.

We were able to use this information to find the port number for the license server and the clients could connect.

  • Netstat: network analysis and troubleshooting, explained (
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