This is the code required to reproduce a bug in SignalR where joining a Group will allow messges to be invoked on the server even if the hub is not conencted to

Hub.cs

//This is the code required for the hub

public class TestHub :Hub
    {
        public void joinGroup()
        {
            Groups.Add(Context.ConnectionId, "base");
        }

        public void Send()
        {
            //This is to show that send will not be invoked
            Clients.Caller.Send("new message");
            
            //This is to show that the group will be invoked
            Clients.Group("base").Send("group message");
        }
    }

index.cshtml

@{
    ViewBag.Title = "Index";
}

@section scripts { 
    <script type="text/javascript" src="~/Scripts/jquery-1.9.0.js"></script>
    <script type="text/javascript" src="~/Scripts/jquery.signalR-1.0.0-rc2.min.js"></script>

    <script type="text/javascript">
        

        var connection = $.hubConnection();
        var proxy = null;
       
        connection.start().done(function () {
            proxy = connection.createHubProxy('testHub');
            $('#clicker').bind('click', function () {
                proxy.invoke('send');
            });

            $('#joinGroup').bind('click', function () {
                proxy.invoke('joinGroup');
            });

            proxy.on('send', function (message) {
                console.log(message);
            });
        });
    </script>
}
<h2>Index</h2>

First Click the Click Me button, this shows that if you aren't in a group you won't get a message.

Then click the Join group button, and the Click Me button again, which will show the messages in the console.

<button id="clicker">Click Me</button>

<button id="joinGroup">Join the Group</button>