title: Using Fiddler with Windows Store Unit Test
body: <p>I want to run Fiddler to help debug a portable API client that I'm developing.</p>
  
  <p>In Visual Studio, on the Windows Store Unit Test project property page > Debug tab I have checked the 'Allow Local Network Loopback' option.</p>
  
  <p>Every web request run during a store unit test fails with a <code>System.Net.Sockets.SocketException</code> : <code>A connection attempt failed because the connected party did not properly respond after a period of time or established connection failed because connected host has failed to respond 127.0.0.1:8888</code>.</p>
  
  <p>The Uri I'm connecting to is not local - but another machine on the local network - so this fiddler loopback address is indeed coming from the global proxy setting.</p>
  
  <p>I know that for <a href="http://blogs.msdn.com/b/fiddler/archive/2011/12/10/fiddler-windows-8-apps-enable-loopback-network-isolation-exemption.aspx" rel="nofollow">Windows Store Apps you have to enable the loopback network isolation exemptions</a> and have ticked every app container listed in the UI for that (despite none of them being related to VS or this unit test projects) - to no avail.</p>
  
  <p>I've also tried disabling IPv6 in Fiddler - don't know why I thought that might work, but it was worth a punt - it didn't work either.</p>
  
  <p>Anyone got any ideas!?</p>