title: Visual Studio Error: (407: Proxy Authentication Required)
body: <p>I am behind a corporate proxy server which requires credentials. I have been trying to connect to a TFS server (on tfspreview.com) with <strong>MS Visual Studio Pro 2012</strong> for the last 2 hours with no success. Every attempt has been met with this error:</p>
  
  <p><img src="https://i.stack.imgur.com/v44qx.jpg" alt="enter image description here"></p>
  
  <p>The integrated browser works fine when I initiate it. It asks me for my proxy login credentials and once entered, off I go. So there is some different method of connection happening here.</p>
  
  <p>I have also navigated to the TFS server, and once in my project I clicked <strong>Open new instance of Visual Studio</strong>. The new instance fails with this message in the output:</p>
  
  <pre><code>HTTP code 407: Proxy Authentication Required
  </code></pre>
  
  <p>I have tried everything that I found on <a href="https://stackoverflow.com/questions/2859148/visual-studio-2010-cannot-connect-for-any-online-resource">another post</a> to no avail. I have made every edit and combination edits to <strong>devev.exe.config</strong> that I have found with no success.</p>
  
  <p>Could it be that the 2010 version is somehow different than the 2012 Pro edition? I am running Windows 7.</p>
  
  <p>Can anyone shed some light? Please?</p>
  
  <p><strong>Note:</strong> This problem also applies to Visual Studio 2013</p>