How to – Kill process from Command Prompt
Open up an Administrative level Command Prompt and run tasklist or netstat -ano | findstr :portNumber to see all of the running processes:
C:\Users\Hussain>tasklist
C:\Users\Hussain>netstat -ano | findstr :portNumber ( in this case port 3000)
C:\Users\Hussain>Taskkill /PID /F
Below is the screenshot of the above steps performed.