title: React Native - No connection to Smartphone using Expo
body: <p>I'm making a new project with React Native, and I'm using Ubuntu on WSL on Windows 10.  I'm also using Expo on my smartphone in the same network with <code>expo start --tunnel</code>.   But after some period of time, I get the error:</p>
  <pre><code>Cannot connect to Metro.
  
  Try the following to fix the issue:
  
  Ensure that Metro is running and available on the same network
  
  Ensure that your device/emulator is connected to your machine and has USB debugging enabled - run 'adb devices' to see a list of connected devices
  
  If you're on a physical device connected to the same machine, run 'adb reverse tcp:8081 tcp:8081' to forward requests from your device
  
  If your device is on the same Wi-Fi network, set 'Debug server host &amp; port for device' in 'Dev settings' to your machine's IP address and the port of the local dev server - e.g. 10.0.1.1:8081
  URL: q3-fmi.anonymous.sistema-mobile-fluxo.exp.direct:80
  
  Error: null at node_modules/metro-runtime/src/modules/vendor/eventemitter3.js:195:15 in emit at node_modules/metro-runtime/src/modules/HMRClient.js:50:6 in _ws.onerror at node_modules/react-native/Libraries/WebSocket/WebSocket.js:271:8 in _eventEmitter.addListener$argument_1 at node_modules/react-native/Libraries/vendor/emitter/_EventEmitter.js:150:10 in EventEmitter#emit
  </code></pre>