Sample WCF service that services content over HTTP and authenticates with NTLM

WindowsAuthService.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.ServiceModel.Web;
using System.Text;

namespace WindowsAuthService
{
    [ServiceContract]
    public interface ITestService
    {
        [OperationContract]
        [WebGet(UriTemplate = "{*path}")]
        Stream Get(string path);
    }


    public class TestService : ITestService
    {
        public Stream Get(string path)
        {
            WebOperationContext.Current.OutgoingResponse.Headers.Add(HttpResponseHeader.ContentType, "text/plain");
            if (OperationContext.Current.ServiceSecurityContext == null)
                return new MemoryStream(Encoding.ASCII.GetBytes(String.Format("Hello, {0}!", "Anonymous Stranger")));
            else
                return new MemoryStream(Encoding.ASCII.GetBytes(String.Format("Hello, {0}!", OperationContext.Current.ServiceSecurityContext.WindowsIdentity.Name)));
        }
    }

    class Program
    {
        private const string URL = "http://e278-jsc.eni.local:7777";
        static void Main(string[] args)
        {
            WebServiceHost serviceHost = new WebServiceHost(new TestService());
            foreach (IServiceBehavior attr in serviceHost.Description.Behaviors)
            {
                if (attr is ServiceBehaviorAttribute)
                {
                    ServiceBehaviorAttribute serviceAttr = (ServiceBehaviorAttribute)attr;
                    serviceAttr.InstanceContextMode = InstanceContextMode.Single;
                    serviceAttr.ConcurrencyMode = ConcurrencyMode.Multiple;
                }
            }
            WebHttpBinding binding = new WebHttpBinding(WebHttpSecurityMode.TransportCredentialOnly);
            binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Ntlm;
            ServiceEndpoint serviceEndpoint = serviceHost.AddServiceEndpoint(typeof (ITestService), binding, URL);
            serviceEndpoint.Behaviors.Add(new WebHttpBehavior());
            Console.WriteLine("Service Listening @ " + URL);
            serviceHost.Open();
            Console.WriteLine("[ Press Enter to Quit ]");
            Console.ReadLine();
        }
    }
}