Invoke javascript method from ASP.NET MVC controller using SignalR - asp.net-mvc

Question

I am using SignalR in my application in order to be able to automatically invoke one JavaScript method whenever a specific action method of a ASP.NET MVC controller is accessed/hit/invoke. Everything works fine on the first hit. But when I try to hit the controller action second time my HttpWebRequest times out. Following is my controller:
public class ShowRoomHubController : Controller
{
public void UpdateDressingRoomData()
{
var hubContext = GlobalHost.ConnectionManager.GetHubContext<ShowRoomHub>();
hubContext.Clients.All.acceptGreet();
}
}
My hub is as follow:
public class ShowRoomHub : Hub
{
public void Hello()
{
Clients.All.hello();
}
public void GreetAll()
{
// Call the addNewMessageToPage method to update clients.
Clients.All.acceptGreet("test now");
}
}
Calling UpdateDressingRoomData action from HttpWebRequest or HttpClient works for first time only then it starts timing out. Here is my console application code (HTTP client):
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://localhost:81/ShowRoomHub/UpdateDressingRoomData");
var response = request.GetResponse();
response.Close();
Or
var httpClient = new HttpClient();
var response = httpClient.GetAsync("http://localhost:81/ShowRoomHub/UpdateDressingRoomData").Result;
Here is my javascript client side code:
connection = $.hubConnection();
//Creating proxy
this.proxy = connection.createHubProxy('showRoomHub');
connection.logging = true;
//Publishing an event when server pushes a greeting message
this.proxy.on('acceptGreet', function () {
//alert('message');
$rootScope.$emit("acceptGreet", null);
});
//Starting connection
connection.start().done(function () {
//alert('started');
});
Any idea what's wrong in my code?