Apns c#异常无法从传输连接读取数据远程主机强制关闭了现有连接

我正在尝试发送带有有效p12和令牌的苹果推送通知，如下所示：

void connect()
        {
            client = new TcpClient();
            //Notify we are connecting
            var eoc = this.OnConnecting;
            if (eoc != null)
                eoc(this.appleSettings.Host, this.appleSettings.Port);
            try
            {
                client.Connect(this.appleSettings.Host, this.appleSettings.Port);
            }
            catch (Exception ex)
            {
                throw new ConnectionFailureException("Connection to Host Failed", ex);
            }
            if (appleSettings.SkipSsl)
            {
                networkStream = client.GetStream();
            }
            else
            {
                stream = new SslStream(client.GetStream(), false,
                    new RemoteCertificateValidationCallback((sender, cert, chain, sslPolicyErrors) => { return true; }),
                    new LocalCertificateSelectionCallback((sender, targetHost, localCerts, remoteCert, acceptableIssuers) =>
                    {
                        return certificate;
                    }));
                try
                {
                    stream.AuthenticateAsClient(this.appleSettings.Host, this.certificates, System.Security.Authentication.SslProtocols.Tls, false);
                    //stream.AuthenticateAsClient(this.appleSettings.Host);
                }
                catch (System.Security.Authentication.AuthenticationException ex)
                {
                    throw new ConnectionFailureException("SSL Stream Failed to Authenticate as Client", ex);
                }
                if (!stream.IsMutuallyAuthenticated)
                    throw new ConnectionFailureException("SSL Stream Failed to Authenticate", null);
                if (!stream.CanWrite)
                    throw new ConnectionFailureException("SSL Stream is not Writable", null);
                networkStream = stream;
            }
            //Start reading from the stream asynchronously
            Reader();
        }
    }

当我将行代码：System.Security.Authentication.SslProtocols.Tls更改为System.Security.Aauthentication.SllProtocols.Ssl3时，我得到"由于远程方关闭了传输流，身份验证失败"

如何发送APNS？我怎样才能发送弹片？？？