title: android studio can't connect to debug devices
body: <p>Android Studio can't connect to debug devices.</p>
  
  <p>When I click the debug button, the debug tab shows me</p>
  
  <pre><code>Connecting to the target VM, address: 'localhost:8600', transport: 'socket'
  </code></pre>
  
  <p>in variables </p>
  
  <p>When I tried again it told me </p>
  
  <pre><code>12:14:44 Error running Android Debugger (8600): Unable to open debugger port : java.io.IOException "handshake failed - connection prematurely closed"
  </code></pre>
  
  <p>and then debug tab show me this </p>
  
  <pre><code> Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'
  </code></pre>
  
  <p>in variables</p>
  
  <p>My Android Studio version is <code>0.4.4 #AI133-1005886</code></p>
  
  <p>This problem has been haunting me for a long time.</p>
  
  <p>i use OS X </p>