title: android studio error Error:Connection timed out
body: <p>I just create a new Project in the android studio and add gcm module to it.<br>
  and I keep giving this error message       </p>
  
  <pre><code>Error:Connection timed out: connect. If you are behind an HTTP proxy, please configure the proxy settings either in IDE or Gradle.      
  </code></pre>
  
  <p>and I do not use any proxy.<br>
  can anyone help me about this?</p>
  
  <p><strong>Update</strong><br>
  now after rebuild my project i give this error      </p>
  
  <pre><code>Error:A problem occurred configuring project ':app'.    
   A problem occurred configuring project ':backend'.
  Could not resolve all dependencies for configuration ':backend:classpath'.
     Could not resolve com.google.appengine:gradle-appengine-plugin:1.9.18.
      Required by:
          PushStart:backend:unspecified
        Could not resolve com.google.appengine:gradle-appengine-plugin:1.9.18.
        Could not get resource 'https://jcenter.bintray.com/com/google/appengine/gradle-appengine-plugin/1.9.18/gradle-appengine-plugin-1.9.18.pom'.
        Could not GET 'https://jcenter.bintray.com/com/google/appengine/gradle-appengine-plugin/1.9.18/gradle-appengine-plugin-1.9.18.pom'.
        Connection to https://jcenter.bintray.com refused
  </code></pre>