You can kill a running port using:
npx kill-port 8080 for windows if you have npm. or taskkill /PID 2660 /F
npx kill-port 8080
taskkill /PID 2660 /F
for linux you can just run kill -9 $(lsof -t -i:8000)
kill -9 $(lsof -t -i:8000)