ApplePushNotificationService Error

Trying to send notification and getting the error below:

ERROR ApplePushNotificationService - Failed to send push notification to client via Apple Push Notification Service: NotificationResponse{​​error=null, httpStatusCode=-1, responseBody='null', cause=java.io.IOException: Unexpected response code for CONNECT: 403}​​

Anyone encountered this error before please help.
ApplePushNotificationService Error
 
 
Q