SampleKdc.cs

static async Task Main()
{
    var builder = new HostBuilder()
        .ConfigureLogging((_, factory) =>
        {
            factory.AddConsole(opt => opt.IncludeScopes = true);
            factory.AddFilter<ConsoleLoggerProvider>(level => level >= LogLevel.Trace);
        });

    var host = builder.Build();

    var logger = (ILoggerFactory)host.Services.GetService(typeof(ILoggerFactory));

    KdcServiceListener listener = new KdcServiceListener(new ListenerOptions
    {
        ListeningOn = new IPEndPoint(IPAddress.Loopback, 8888),
        Log = logger,
        DefaultRealm = "corp2.identityintervention.com".ToUpper(),
        IsDebug = true,
        RealmLocator = realm => LocateRealm(realm),
        ReceiveTimeout = TimeSpan.FromHours(1)
    });

    await listener.Start();

    listener.Dispose();
}

private static Task<IRealmService> LocateRealm(string realm)
{
    IRealmService service = new FakeRealmService(realm);

    return Task.FromResult(service);
}