C#•2y ago

TcpClient connection

using TcpClient tcpClient = new(domain, port);

using TcpClient tcpClient = new(domain, port);

When I let this run on my local machine, it works fine. But on our server, I get System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (10060). But only for some websites. I am using Port 443. Goal is to read the certificate with SslStream afterwards. When I tested it on the system of a colleague, he first had to run the program with Visual Studio, otherwise the exe produced the same errors for some websites as on the server. I have no idea what the issue could be.

1 Reply

Iceman228OP•2y ago

var certificate = await SSL.GetCertificateAsync(url);



        private static readonly RemoteCertificateValidationCallback _certificateValidationCallback = (_, _, _, _) => true;

        public static async Task<X509Certificate2?> GetCertificateAsync(string domain, int port = 443)
        {
            using TcpClient tcpClient = new(domain, port);
            using SslStream sslStream = new(tcpClient.GetStream(), leaveInnerStreamOpen: true, _certificateValidationCallback);

            await sslStream.AuthenticateAsClientAsync(domain).ConfigureAwait(false);

            var serverCertificate = sslStream.RemoteCertificate;
            if (serverCertificate != null)
                return new X509Certificate2(serverCertificate);

            return null;
        }
    }

var certificate = await SSL.GetCertificateAsync(url);



        private static readonly RemoteCertificateValidationCallback _certificateValidationCallback = (_, _, _, _) => true;

        public static async Task<X509Certificate2?> GetCertificateAsync(string domain, int port = 443)
        {
            using TcpClient tcpClient = new(domain, port);
            using SslStream sslStream = new(tcpClient.GetStream(), leaveInnerStreamOpen: true, _certificateValidationCallback);

            await sslStream.AuthenticateAsClientAsync(domain).ConfigureAwait(false);

            var serverCertificate = sslStream.RemoteCertificate;
            if (serverCertificate != null)
                return new X509Certificate2(serverCertificate);

            return null;
        }
    }

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