How to kill a system process on a port

When using Tomcat on Windows, it is quite often that we run into the following error:

Several ports (8000, 8443, 8009) required by Tomcat v7.0 Server at localhost (3) are already in use. The server may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s).

Solution:

1.  Start a command prompt as an administrator

a. Click Start, click All Programs, and then click Accessories.

b. Right-click Command prompt, and then click Run as administrator.

2.  Find the PID on the port, as as netstat -o -n -a | findstr 8000

3.  Kill the process by PID, such as taskkill /F /PID 2256

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