title: Nuget under Visual Studio 2012 fails when searching for packages
body: <p>I am behind a corporate firewall. However if I go straight to the PowerShell</p>
  
  <pre><code>Install-Package ReactiveUI
  </code></pre>
  
  <p>there is no problem. If I open the package manager and click on 'online' I can browse all the online packages from codeplex.</p>
  
  <p>However as soon as I enter a search term in the package manager. I get the following error</p>
  
  <pre><code>Could not connect to the feed specified at 'https://nuget.org/api/v2'. 
  Please verify that the package source ( located in the Package Manager Settings) 
  is valid and ensure your network connectivity.
  </code></pre>
  
  <p>After I get this error the first time then Nuget fails to work even at the console.</p>