title: Eclipse Neon HTTP Proxy Authentication Required Error
body: <p>When I go to "Install new software" and select an update site or 
  go to "Available Software Site" and click "Reload", I get a "HTTP Proxy Authentication Required" error.</p>
  
  <p>I have searched the web, and I've tried the found suggestion like setting <code>eclipse.ini</code> with</p>
  
  <pre><code>-vmargs -Djava.net.preferIPv4Stack=true
  -Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclient4
  </code></pre>
  
  <p>I set the Neon link in an Helios version and it show the Available Software wihtout error.</p>
  
  <p><a href="http://download.eclipse.org/releases/neon" rel="noreferrer">http://download.eclipse.org/releases/neon</a></p>
  
  <p>HTTP Proxy Authentication Required: <a href="http://download.eclipse.org/releases/neon/compositeContent.xml" rel="noreferrer">http://download.eclipse.org/releases/neon/compositeContent.xml</a>
  HTTP Proxy Authentication Required: <a href="http://download.eclipse.org/releases/neon/compositeContent.xml" rel="noreferrer">http://download.eclipse.org/releases/neon/compositeContent.xml</a>
  Proxy Authentication Required</p>
  
  <p>I've not config Eclipse to authenticate against any proxy.</p>
  
  <p>Version: Neon Release (4.6.0)
  Build id: 20160613-1800 </p>
  
  <p>Windows 7 64bit </p>
  
  <p>How can I set it to work?
  I'm inside a company netword but I have also tried in my home with the same Laptop and the problem persist.</p>