class Program
    {
        static void Main(string[] args)
        {
            var uri = new Uri("https://46.13.13.108:11001");
            var credentialsCache = new CredentialCache { { uri, "NTLM", new NetworkCredential("konica", "Kotatko123+", "ntcogebi") } };
            var handler = new HttpClientHandler { Credentials = credentialsCache };

            handler.ServerCertificateCustomValidationCallback += Program.CertificateValidationCallBack;

            var httpClient = new HttpClient(handler) { BaseAddress = uri, Timeout = new TimeSpan(0, 0, 10) };
            httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            var response = httpClient.GetAsync("api/vendors?id=31045687&vatnum=CZ43774750").Result;

            if (response.IsSuccessStatusCode)
            {
                Task<string> content = response.Content.ReadAsStringAsync();
                Console.WriteLine(content.Result);
            }
            else
            {
                throw new HttpRequestException(response.Content.ReadAsStringAsync().Result);
            }

            Console.ReadLine();
        }

        public static bool CertificateValidationCallBack(
         object sender,
         System.Security.Cryptography.X509Certificates.X509Certificate certificate,
         System.Security.Cryptography.X509Certificates.X509Chain chain,
         System.Net.Security.SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }

    }