Simple console app for testing how mod_nss handles client certificates

Program.cs

using System;
using System.IO;
using System.Net.Http;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;

namespace NssTest
{
    class Program
    {
        static async Task Main(string[] args)
        {
            // Load the client cert, ensuring we can access the private key
            var clientCertFile = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ClientCert.p12");
            var clientCert = new X509Certificate2(clientCertFile, String.Empty, X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet);

            using (var handler = new HttpClientHandler())
            {
                // Just accept all server certs
                handler.ServerCertificateCustomValidationCallback += (message, serverCert, chain, errors) 
                    => true;

                handler.ClientCertificateOptions = ClientCertificateOption.Manual;
                handler.ClientCertificates.Add(clientCert);

                using (var httpClient = new HttpClient(handler))
                {
                    var result = await httpClient.GetStringAsync(@"https://172.17.147.210:443");
                    Console.WriteLine(result);
                }
            }        
        }
    }
}