title: create-react-app - Why localhost is not working?
body: <p>After creating a new react app using create-react-app, once I start the dev server via <strong>npm start</strong>, the server started and shows this:</p>
  
  <p><a href="https://i.stack.imgur.com/f8psM.png" rel="noreferrer"><img src="https://i.stack.imgur.com/f8psM.png" alt="enter image description here"></a></p>
  
  <p>I'm sure that until last week I could open <a href="http://localhost:3000" rel="noreferrer">http://localhost:3000</a> to see the new created app in browser, but now it doesn't work any more and shows this:</p>
  
  <p><a href="https://i.stack.imgur.com/BDnQK.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BDnQK.png" alt="enter image description here"></a></p>
  
  <p>But, it works if I open <a href="http://192.168.119:3000" rel="noreferrer">http://192.168.119:3000</a></p>
  
  <p>I haven't changed anything inside my .hosts file.</p>
  
  <p>Does any one know why I cannot use <a href="http://localhost:3000" rel="noreferrer">http://localhost:3000</a> any more?</p>