What steps will reproduce the problem? While connecting it shows the following error-

a call to SSPI failed

What is the expected output? What do you see instead? I want to send the badge to my iPhone application using my service.

What version of the product are you using? On what operating system?

Apns-Sharp-1.0.1.0-Source. Operating syste- Windows XP

Please provide any additional information below. The service is working fine but it shows the error while connection therefore not able to send badge to my iPhone application.

Your source code gives me lot of support, but still needs some help to finalize my service

This almost always means that your SSL Certificate has expired or is otherwise invalid.

Please create a new SSL certificate and try it again. There's also the possibility that the .p12 or .pfx file you're trying to use does not contain the Certificate AS WELL AS the private key which it must!