iPhone certificate error in apns sharp A call to SSPI failed

Question

i have a data service hosted in azure from which i am sending notification to iphone but while establishing connection with apns i am getting following error "A call to SSPI failed. The message received was unexpected or badly formatted." i also refered following links for the same error but still getting the error

apple push notification with APNS sharp and C# iPhone push server?

        try
        {
            using (TcpClient client = new TcpClient())
            {

                try
                {
                    client.Connect("gateway.sandbox.push.apple.com", 2195);
                    Logging("TSSLProDi :Connected to Apple");
                }
                catch (Exception ex)
                {
                    Logging("TSSLProDi :" + ex.Message + "-IE-" + ex.InnerException);

                }
                using (NetworkStream networkStream = client.GetStream())
                {
                    Logging("TSSLProDi :Client connected.");

                    X509Certificate clientCertificate = new X509Certificate(System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory + @"startup\certname.pfx"), "mycertpassword");
                    X509CertificateCollection clientCertificateCollection = new X509CertificateCollection(new X509Certificate[1] { clientCertificate });

                    // Create an SSL stream that will close the client's stream.
                    SslStream sslStream = new SslStream(
                        client.GetStream(),
                        false,
                        new RemoteCertificateValidationCallback(validateServerCertificate),
                        null
                        );

                    try
                    {
                        sslStream.AuthenticateAsClient("gateway.sandbox.push.apple.com", clientCertificateCollection, System.Security.Authentication.SslProtocols.Default, false);
                        Logging("TSSLProDi :slStreamAuthenticated");
                    }
                    catch (AuthenticationException ex)
                    {
                        Logging("TSSLProDi :" + "Exception: " + ex.Message.ToString());
                        if (ex.InnerException != null)
                        {
                            Logging("Inner exception: " + ex.InnerException.Message.ToString());
                        }
                        Logging("TSSLProDi :" + "Authentication failed - closing the connection.");
                        client.Close();
                        return;
                    }
                }

            }
        }
        catch (Exception ex)
        {

            Logging("TSSLProCert :" + ex.Message + "-IE-" + ex.InnerException);
        }

i have installed the needed certificates on VM also. one warning i am getting on iphone developer_identity certificate which i got from apple is that "Windows does not have enough information to verify this certificate" is there is some thing wrong with my iphone certificate. please help me i am stuck

Answer 1

got the solution i have just changed X509Certificate to X509Certificate2 and X509CertificateCollection to X509Certificate2Collection