title: Are group subscriptions automatically handled on Reconnect?
body: <p>I have a chat room using SignalR Hub for its messaging.  Occasionally I get reports from users where it 'freezes'.  Now this can be interpreted as no messages are coming through, I suspect as they have been dropped from a group.</p>
  
  <p>My question is, does the connection get re-subscribed back into its groups automatically, or do you have to do something yourself in the Reconnect method: </p>
  
  <pre><code>public Task Reconnect(IEnumerable&lt;string&gt; groups)
  {
          return Clients.rejoined(Context.ConnectionId, DateTime.Now.ToString());
  }
  </code></pre>