SignalR does not fire a "disabled" event

I am using SignalR to send updates to connected web clients. I am listening to an event disconnected

to know when I should start the reconnect logic

$.connection.hub.disconnected(function() {
    // Initiate my own reconnection logic
});

      

        
        
        
      

    

SignalR Console is hosted on IIS (along with my site)

[assembly: OwinStartup(typeof(Startup))]
namespace MyNamespace.SignalR
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }
}

      

        
        
        
      

    

After connecting, the client calls the server method to join the group

public class MyHub : Hub
{
    public void JoinGroup(string groupName)
    {
        Groups.Add(Context.ConnectionId, groupName);
    }
}

      

        
        
        
      

    

And then I output messages to this group:

context.Clients.Group(groupName).sendMessage();

      

        
        
        
      

    

If I manually recycle the application pool in IIS, SignalR starts trying to connect and I end up getting a disconnected

client side event if it doesn't work (after timeout).

However, my problem is that if I manually reload the website in IIS, I don't get any event at all disconnected

, and I don't see in the logs that SignalR detected any connection problem at all. How can I detect that I have been disconnected?

I know that I should probably persist in group communication, as it is memorized, I think. But that shouldn't affect the original issue where the client doesn't receive disconnect notification? Should the client code signalr throw some kind of exception / event?