title: signalr The connection id is in the incorrect format
body: <p>I have a project build from mvc4 c# razor engine.
  I added latest signalr nuget package 1.0.1
  My project uses form authentication. 
  each time the client goes from login to logout and vise versa I get an error on the client :</p>
  
  <pre><code>&gt; "NetworkError: 500 Internal Server Error -
  &gt; http://myhost:51090/signalr/abort?transport=serverSentEvents&amp;connectionToken=uIJvYLP3T0GdHaowIlS4uPDA19ukUy7TaW8dcXoPfma4Mr52uoe7PLK9Hh3ip17X_3RbFXx92yEa7nxYVHaCiRAWVE5e05vvpLD0_blb94eUwdkXbmhkRPM2_Z590A64VBF2-eLB_8wCWq-dmkkkbe6EqP6c9YXN3WRF5IyNYkB6Wkom7O1ZoDavQQ0UWvok0"
  </code></pre>
  
  <p>and in the server side :</p>
  
  <pre><code> The connection id is in the incorrect format.
  </code></pre>
  
  <p>do I need to consider working  with signalr in different way (from <a href="https://github.com/SignalR/SignalR/wiki/QuickStart-Hubs" rel="nofollow">https://github.com/SignalR/SignalR/wiki/QuickStart-Hubs</a>) then with authentication ? </p>