SignalR OnConnected method not firing when multiple users sign in

Question

I have been trying to add a real-time notification feature to an MVC website using SignalR. I am using Asp.NET Identity for authentication.

As I understood from SignalR documentation the OnConnected method on Hub class should fire whenever a user logs in.

So when I came to debug, if I sign the first user, the OnConnected method called properly. However, when I open another browser(eg: Firefox, Microsoft edge ..) and sign in another user, OnConnected is never called.

My Startup class looks like this:

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

Hub class

namespace NotificationApp
{    
    [Authorize]
    public class NotificationHub : Hub {
        
        //This gets called for the first logged in user only
        public override Task OnConnected()
        {
            Clients.Client(Context.ConnectionId).connected(Context.ConnectionId);

            return base.OnConnected();
        }

       public override Task OnDisconnected(bool stopCalled)
        {
            return base.OnDisconnected(stopCalled);
        }
   }
}

Client code

$(document).ready(function () {
    var notificationHub = $.connection.notificationHub;
    
    //Called for every client properly
    $.connection.hub.start().done(function () {

     console.log('Notification hub started');
      
    });

 //This gets called for the first logged in user only
 notificationHub.client.connected = function (message) {

        console.log('Hello' + message);
    };

});

Answer 1

When you open another tab, you are the same client and are then given a connectionID.

Try changing "Client":

        public override Task OnConnected()
    {
        Clients.Client(Context.ConnectionId).connected(Context.ConnectionId);

        return base.OnConnected();
    }

To "Caller":

        public override Task OnConnected()
    {
        Clients.Caller.connected(Context.ConnectionId);

        return base.OnConnected();
    }

Also, move your client function before your hub.start. You should always register one function before your start. See the note regarding in the docs.