title: Maven discovery completed without finding any extensions
body: <p>I have installed eclipse 4.3 on my system and recently installed the Maven integration plugin. I get the following error: </p>
  
  <blockquote>
    <p>Discovery completed without finding any extensions. Please check your network connection and try again.</p>
  </blockquote>
  
  <p>The catalog url is <code>http://download.eclipse.org/technology/m2e/discovery/directory-1.4.xml</code></p>
  
  <p><strong>Note</strong>: No proxies, no network issues</p>