matar el puerto ya en uso
kill -9 $(lsof -i tcp:3000 -t)
Fancy Fox
kill -9 $(lsof -i tcp:3000 -t)#To list any process listening to the port 8080:
lsof -i:8080
#To kill any process listening to the port 8080:
kill $(lsof -t -i:8080)
#or more violently:
kill -9 $(lsof -t -i:8080)sudo lsof -i :3000
kill -9 PIDC:\> netstat -ano | findstr :YourPortNumberkill -9 <PID>
kill $(lsof -t -i:53) #Kill the process listening on port 53