sudo lsof -i :<PORT> kill -9 <PID>
lsof -i tcp:3001 kill -9 {PID}
$ tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 125004/nginx
comSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)