EWS Push Notification : Notification Service is not getting called from Exchange Server.

Question

I have written 2 web services 1) Subscribing to Exchange Server 2) Notification client
I am able to create subscription to Exchange Server. But from Exchange server my notification client webservice is nt getting called. I am not sure how i am missing out any setting. below is my subscribe code and notification client code.
Subscribe code :
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
                service.UseDefaultCredentials = true;
                service.Url = new Uri(exchangeServerurl);
                FolderId parentId= FindFolderIdByDisplayName(service, "Order", WellKnownFolderName.PublicFoldersRoot);
                 pushSubscription = service.SubscribeToPushNotifications(
                            new FolderId[] {FindFolderIdfromRoot(service, "EmpCreatealert", parentId)},
                            new Uri(notificationService)         /* The endpoint of the listener. */,
                            1                              /* Get a status event every 5 minutes if no new events
are available. */,
                            null                           /* watermark: null to start a new subscription. */,
                            EventType.NewMail);
Notification client : 
 public class Notification : NotificationServicePortType, INotification 
        public SendNotificationResponse SendNotification(SendNotificationRequest request)
            log("Enter SendNotification");
            SendNotificationResponse snr = new SendNotificationResponse();
            snr.SendNotificationResult = new SendNotificationResultType();
            snr.SendNotificationResult.SubscriptionStatus = SubscriptionStatusType.OK;
            return snr;
Can anyone suggest me what els i should do to get notification client to get called.

Answer 1

How are you testing this ? Are you just creating posts in the Public Folder or is the folder mail enabled and your sending email to it ?
Are you getting the heartbeat notifications ?
Have you tested your endpoint is accessible from the Exchange Server ? are you getting any error logged see
http://www.infinitec.de/post/2009/06/21/Troubleshooting-Push-notifications-failures.aspx
Your only subscribing to the NewMail event on public folder I would suggest at least for testing you subscribe to the CreateItem, MoveItem, DeleteItem events as well to see if other event fires when you create and delete Items in the folder. You might also
want to test something like
http://blogs.msdn.com/b/emeamsgdev/archive/2012/12/20/ews-push-notification-sample.aspx which is a basic sample
Cheers
Glen