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            ServicePointManager.ServerCertificateValidationCallback += ValidateRemoteCertificate;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

        /// <summary>
        /// Certificate validation callback.
        /// </summary>
        private static bool ValidateRemoteCertificate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
        {
            // If the certificate is a valid, signed certificate, return true.
            if (error == System.Net.Security.SslPolicyErrors.None)
            {
                return true;
            }

            Console.WriteLine("X509Certificate [{0}] Policy Error: ‘{1}‘",
                cert.Subject,
                error.ToString());

            return false;
        }