namespace ConsoleApplication.TestHttps
{
    class Program
    {
        static void Main(string[] args)
        {
            ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, errors) => true;

            X509Store storeMy = new X509Store(StoreName.My, StoreLocation.CurrentUser);
            storeMy.Open(OpenFlags.ReadOnly);

            var certs = storeMy.Certificates.Find(X509FindType.FindByThumbprint,  "e2 c8 16 18 16 06 42 e5 6f 33 63 f7 d0 4d 64 e1 c6 d8 4b 8b", false);

            if (certs.Count == 0)
                throw new Exception("Не найден сертификат");

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://217.107.108.156:10081/ext-bus-bills-service/services/Bills?wsdl");
            request.Credentials = CredentialCache.DefaultCredentials;
            request.ClientCertificates.Add(certs[0]);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (request.ServicePoint.Certificate != null)
            {
                X509Certificate c = request.ServicePoint.Certificate;
                Console.WriteLine("Сертификат сервера: " + c);
            }
            response.Close();
        }
    }
}