IOS Push Notification Problem - Authentication failed because the remote side closed the transport stream

Question

I use the code below for push notification.

public void PushNotificationIOS(string message, string registrationKey) { string deviceID = registrationKey; int port = 2195; String hostname = System.Configuration.ConfigurationManager.AppSettings["HostName"];//"gateway.sandbox.push.apple.com"; string certPath = string.Empty; certPath = System.Configuration.ConfigurationManager.AppSettings["CertificatePath"] + System.Configuration.ConfigurationManager.AppSettings["Cer String certificatePath = System.Web.HttpContext.Current.Server.MapPath(certPath); string certPassword = System.Configuration.ConfigurationManager.AppSettings["CertificatePassword"]; TcpClient client = new TcpClient(hostname, port); try { X509Certificate2 clientCertificate = new X509Certificate2(System.IO.File.ReadAllBytes(certificatePath), certPassword); X509Certificate2Collection certificatesCollection = new X509Certificate2Collection(clientCertificate); SslStream sslStream = new SslStream(client.GetStream(), false, new RemoteCertificateValidationCallback(ValidateServerCertificate), null); sslStream.AuthenticateAsClient(hostname, certificatesCollection, SslProtocols.Tls, false); MemoryStream memoryStream = new MemoryStream(); BinaryWriter writer = new BinaryWriter(memoryStream); writer.Write((byte)0); writer.Write((byte)0); writer.Write((byte)32); writer.Write(StringToByteArray(deviceID.ToUpper())); String payload = "{\"aps\":{\"alert\":\"" + message + "\",\"badge\":0,\"sound\":\"default\"}}"; writer.Write((byte)0); writer.Write((byte)payload.Length); byte[] b1 = System.Text.Encoding.UTF8.GetBytes(payload); writer.Write(b1); writer.Flush(); byte[] array = memoryStream.ToArray(); sslStream.Write(array); sslStream.Flush(); client.Close(); } catch (System.Security.Authentication.AuthenticationException ex) { client.Close(); } } 

I get the following error Authentication failed because the remote side has closed the transport stream. In Trace, I get below

 System.Net.Security.SslState.CheckThrow(Boolean authSucessCheck) at System.Net.Security.SslState.get_SecureStream() at System.Net.Security.SslStream.Write(Byte[] buffer) 

I tried everything that was mentioned in different posts, but cannot solve the problem.

Answer 1

Verify that the certificate is valid and not damaged. You can restore the certificate to be sure.

Try to provide all SecurityProtocolType parameters, for example:

 sslStream.AuthenticateAsClient(hostname, certificatesCollection, SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls, false); 

SecurityProtocolType.Tls12 can negotiate the security level of transport layer 1.1 or down, but try all the options to be sure.

For more information about SecurityProtocolType see below:

https://msdn.microsoft.com/en-us/library/system.net.securityprotocoltype(v=vs.110).aspx