title: gradle sync error android studio
body: <p>I was trying to create some android sample app using android studio and I came across a gradle sync error.</p>
  
  <p>It says unknown host for <a href="http://jcenter.bintray.com" rel="nofollow">jcenter.bintray.com</a> and configure proxy.</p>
  
  <p>But when I try to access it using browser url is accessible. I also tried to check connection in android studio > setting > system settings > http proxy > check connection. </p>
  
  <p>It shows connection successful. So the error occurs only when it builds. what could be the reason?</p>
  
  <p>build.gradle</p>
  
  <pre><code>buildscript {
  repositories {
      jcenter { url "http://jcenter.bintray.com/" }
  }
  
  dependencies {
      classpath 'com.android.tools.build:gradle:2.2.1'
  }
  }
  
  allprojects {
  }
  </code></pre>