asp.net mvc - Push notification in Windows phone 7.1 throwing error PushSharp.WindowsPhone.WindowsPhoneNotificationSendFailureException -

i trying send push notification in windows phone 7.1 throwing error:

pushsharp.windowsphone.windowsphonenotificationsendfailureexception 

following middle-ware code written in server side:

        var push = new pushbroker();         push.onnotificationsent += notificationsent;         push.onchannelexception += channelexception;         push.onserviceexception += serviceexception;         push.onnotificationfailed += notificationfailed;         push.ondevicesubscriptionexpired += devicesubscriptionexpired;         push.ondevicesubscriptionchanged += devicesubscriptionchanged;         push.onchannelcreated += channelcreated;         push.onchanneldestroyed += channeldestroyed;           // windows phone notifications         push.registerwindowsphoneservice();          push.queuenotification(new windowsphonetoastnotification()             .forendpointuri(new uri(url))             .forosversion(windowsphonedeviceosversion.seven)             .withbatchinginterval(batchinginterval.immediate)             // .withnavigatepath("/mainpage.xaml")             .withtext1("notification")             .withtext2("this push notification"));         push.stopallservices(waitforqueuestofinish: true); 

the push sharp handler methods are:

    //this raised when notification sent     static void notificationsent(object sender, inotification notification)     {         debug.writeline("sent: " + sender + " -> " + notification);     }      //this raised when notification failed due reason     static void notificationfailed(object sender, inotification notification, exception notificationfailureexception)     {         debug.writeline("failure: " + sender + " -> " + notificationfailureexception.message + " -> " + notification);     } 

from front end using vs 2010 windows phone framework sending url auto generated:

notification channel uri:http://db3.notify.live.net/throttledthirdparty/01.00/aqe9hz23hr07ryiah7o3seekagaaaaadaqaaaaquzm52ojizoeq2ndjdrki5mevhhsnll8wmq 

but unfortunately, receiving following exception :

failure: pushsharp.windowsphone.windowsphonepushservice -> exception of type 'pushsharp.windowsphone.windowsphonenotificationsendfailureexception' thrown. -> <wp:notification xmlns:wp="wpnotification"> 

help me out. in advance.

the same code worked when tried device

not emulator. may error occurred because of dummy credentials.