Setting Up and Testing Active Directory Failover

using System;
using System.Security.Principal;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;

namespace Contracts
{
	public class WCFHelper
	{
		/// <summary>
		/// Creates an instance of the specified interface type by channeling to the service host.
		/// </summary>
		/// <typeparam name="T">The interface type to create.</typeparam>
		/// <param name="binding">The binding protocol to use.</param>
		/// <param name="endpointAddress">The complete address for the endpoint.</param>
		/// <returns>An instance of type T.</returns>
		public static T CreateChannel<T>(Binding binding, string endpointAddress)
		{
			// Create an endpoint for the specified binding & address
			ServiceEndpoint endpoint = new ServiceEndpoint(ContractDescription.GetContract(typeof(T)), binding, new EndpointAddress(endpointAddress));
			binding.SendTimeout = new TimeSpan(0, 0, 1);
			binding.ReceiveTimeout = new TimeSpan(0, 0, 1);
			binding.OpenTimeout = new TimeSpan(0, 0, 1);
			binding.CloseTimeout = new TimeSpan(0, 0, 1);

			// Create a channel factory of type T
			ChannelFactory<T> factory = new ChannelFactory<T>(endpoint);
			factory.Credentials.Windows.ClientCredential.UserName = "RedundancyCheck";
			factory.Credentials.Windows.ClientCredential.Password = "RedundancyCheck";
			factory.Credentials.Windows.ClientCredential.Domain = "IPAPER";
			factory.Credentials.Windows.AllowedImpersonationLevel = TokenImpersonationLevel.Impersonation;

			// Return the created channel
			return factory.CreateChannel();
		}

		/// <summary>
		/// Creates a ServiceHost hosting the specific implementation TImplementationType of interface TInterfaceType at the specified endpointAddress.
		/// </summary>
		/// <typeparam name="TInterfaceType">The interface type to host.</typeparam>
		/// <typeparam name="TImplentationType">The implementation type to host.</typeparam>
		/// <param name="binding">The binding protocol to use.</param>
		/// <param name="endpointAddress">The endpoint where the service should be hosted at.</param>
		/// <param name="mexEndpointAddress">The endpoint where the service metadata should be hosted at.</param>
		/// <returns>An instance of ServiceHost.</returns>
		public static ServiceHost CreateServiceHost<TInterfaceType, TImplentationType>(Binding binding, string endpointAddress, string mexEndpointAddress)
		{
			// Create new service host
			ServiceHost host = new ServiceHost(typeof(TImplentationType));

			// Create endpoints
			host.AddServiceEndpoint(typeof(TInterfaceType), binding, endpointAddress);

			// Create metadata endpoint if it doesn't exist
			ServiceMetadataBehavior smb = host.Description.Behaviors.Find<ServiceMetadataBehavior>();
			if (smb == null)
			{
				smb = new ServiceMetadataBehavior();
				smb.MetadataExporter.PolicyVersion = PolicyVersion.Policy15;
				host.Description.Behaviors.Add(smb);
			}
			if (binding is NetTcpBinding)
				host.AddServiceEndpoint(ServiceMetadataBehavior.MexContractName, MetadataExchangeBindings.CreateMexTcpBinding(), mexEndpointAddress);
			else if (binding is BasicHttpBinding)
				host.AddServiceEndpoint(ServiceMetadataBehavior.MexContractName, MetadataExchangeBindings.CreateMexHttpBinding(), mexEndpointAddress);
			else
				throw new ArgumentOutOfRangeException("Invalid binding: " + binding);

			return host;
		}
	}
}

using System;
using System.Security;
using System.Security.Permissions;
using System.ServiceModel;
using Contracts;

namespace WcfServer
{
	class Program
	{
		static void Main(string[] args)
		{
			// Create service host
			ServiceHost host = WCFHelper.CreateServiceHost<IServer, Server>(new NetTcpBinding(SecurityMode.Transport), "net.tcp://localhost:8000", "net.tcp://localhost:8000/mex");

			// Open host
			host.Open();

			Console.Read();
		}
	}

	[ServiceBehavior(IncludeExceptionDetailInFaults = true)]
	public class Server : IServer
	{
		public string Ping()
		{
			// Security check
			try
			{
				new PrincipalPermission(null, "ADTest").Demand();
			}
			catch
			{
				throw new SecurityException();
			}

			// Let caller know that we're alive
			return "Pong!";
		}
	}
}

using System;
using System.ServiceModel;
using System.Threading;
using Contracts;

namespace WcfClient
{
	class Program
	{
		static void Main(string[] args)
		{
			while (true)
			{
				try
				{
					IServer server = WCFHelper.CreateChannel(new NetTcpBinding(SecurityMode.Transport), "net.tcp://192.168.0.35:8000");

					using (server as IDisposable)
					{
						try
						{
							Console.WriteLine(server.Ping());
						}
						catch (Exception ex)
						{
							Console.WriteLine(ex.Message);
						}
					}
				}
				catch (CommunicationObjectFaultedException)
				{ }

				Thread.Sleep(250);
			}
		}
	}
}