title: ERR_ADDRESS_UNREACHABLE to opening my localhost in Chrome Android
body: <p>I´m using the task BrowserSync of Grunt, this task launch my local project to the url "localhost:3000".</p>
  
  <p><a href="https://i.stack.imgur.com/sISoF.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/sISoF.jpg" alt="enter image description here"></a></p>
  
  <p>This works fine. But when I use the External url (<a href="http://192.168.1.129:3000" rel="noreferrer">http://192.168.1.129:3000</a>) in my smartphone, I get the following error of my browser Chrome in Android:</p>
  
  <pre><code>ERR_ADDRESS_UNREACHABLE
  </code></pre>
  
  <p>I don't understand this problem. You can see here my Gruntfile.js:</p>
  
  <pre><code>//Gruntfile.js
  module.exports = function (grunt) {
    grunt.initConfig({
  
      //Watch task config
      watch: {
  
      },
      //BrowserSync
      browserSync: {
        default_options: {
          bsFiles: {
            src: [
              "css/*.css",
              "js/*.js",
              "*.html"
            ]
          },
          options: {
            watchTask: true,
            proxy: "tutorialmaterialize.dev"
            }
          }
        }
  
      });
  
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-browser-sync');
  
   //Default task
   grunt.registerTask('default', ['browserSync', 'watch']);
  };
  </code></pre>
  
  <p>how can i fix this?, thanks you very much.</p>