Find that process running at a port and kill it

In Windows (7), You can list all the processes and the port it is running at by:
netstat -ano

To kill a process, replace pid with process id from previous step

taskkill /pid 5844  /F


In Ubuntu, You can find the process running at a port using grep

netsat -ano --program |grep 8080

and
kill porcessNumber

eg.

11814 is process running at port 8080.