SignalR on multiple application pools - asp.net

Question

I am trying to send notifications to specific clients from server about transaction changes. I'm doing well so far in local and development environment, but in LIVE we have 3 app pools (3 physical servers) with loadbalancer (all three have same machine key).
So it looks like when notification is triggered server side on same pool the client is connected - it works, but doesn't work if pools are different.
Can anyone suggest how to deal with this - or maybe the problem is in bad code (incorrect hub context handling or something). I'm new to SignalR - so used examples for message broadcasting from SignalR documentation.
Here is mu hub:
public class ExampleClassHub : Hub
{
private readonly ExampleClass _ExampleClassInstance;
public ExampleClassHub() : this(ExampleClass.Instance) { }
public ExampleClassHub(ExampleClass ExampleClassInstance)
{
_ExampleClassInstance = ExampleClassInstance;
}
}
Here is the class which serves static instance:
public class ExampleClass
{
private readonly static Lazy<ExampleClass> _instance = new Lazy<ExampleClass>(() =>
new ExampleClass(GlobalHost.ConnectionManager.GetHubContext<ExampleClassHub>().Clients));
private IHubConnectionContext<dynamic> Clients { get; set; }
private ExampleClass(IHubConnectionContext<dynamic> clients)
{
Clients = clients;
}
public static ExampleClass Instance
{
get
{
return _instance.Value;
}
}
public void NotifyTransactionChange(int userId, string tid, bool isTransactionSuccessfull)
{
string json = JsonConvert.SerializeObject(new Notification { UserId = userId, Tid = tid, IsTransactionSuccessful = isTransactionSuccessfull });
Clients.User(userId.ToString()).notifyTransactionStateChange(json);
}
class Notification
{
public int UserId { get; set; }
public string Tid { get; set; }
public bool IsTransactionSuccessful { get; set; }
}
}
So from server-side notification is triggered the following way:
ExampleClass.Instance.NotifyTransactionChange(...)

Answer 1

Solved using SignalR scaleout:
http://www.asp.net/signalr/overview/performance/scaleout-in-signalr