wsDualHttpBinding + Windows Server 2003인 경우 발생하는 오류

WSDualHttpBinding 설정의 WCF 서비스를 윈도우 서버 2003 x86 IIS 6.0에서 호스팅하는 경우 ServerTooBusyException, CommunicationObjectFaultedException이 발생할 수 있습니다.

테스트를 위해 웹 프로젝트를 하나 만들고 간단하게 svc 서비스를 추가합니다.

// 인터페이스 정의
using System.ServiceModel;

namespace WebApplication1
{
    [ServiceContract(Namespace = "http://www.wcftest.com/", SessionMode = SessionMode.Required, 
        CallbackContract = typeof(ITestWcfCallback))]
    public interface ITestWcf
    {
        [OperationContract]
        void CheckMethod();

        [OperationContract]
        void CheckMethod2();
    }

    public interface ITestWcfCallback
    {
        [OperationContract(IsOneWay = true)]
        void Reply();
    }
}

// WCF 구현 클래스 정의
using System.ServiceModel;

namespace WebApplication1
{
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
    public class TestWcf : ITestWcfCallback
    {
        public void CheckMethod()
        {
        }

        public void CheckMethod2()
        {
        }
    }
}

using System;
using System.ServiceModel;

namespace WebApplication1
{
    public partial class test : System.Web.UI.Page
    {
        public class TestCallback : ITestWcfCallback
        {
            public void Reply()
            {
            }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            string hostName = Request.Url.Host.ToLowerInvariant();
            int hostPort = Request.Url.Port;

            TestCallback tcb = new TestCallback();
            InstanceContext ctx = new InstanceContext(tcb);

            // http://localhost:.../WCFs/TestWcf.svc/addrWsDualHttpBinding
            string wsDualBindingAddress = string.Format("http://{0}:{1}/TestWcf.svc/addrWsDualHttpBinding",
                hostName, hostPort);

            WSDualHttpBinding wsDualHttpBinding = new WSDualHttpBinding();
            wsDualHttpBinding.Security.Mode = WSDualHttpSecurityMode.None;

            DuplexChannelFactory<ITestWcf> factory =
                new DuplexChannelFactory<ITestWcf>(ctx, wsDualHttpBinding,
                new EndpointAddress(wsDualBindingAddress));
            {
                ITestWcf proxy = factory.CreateChannel();

                proxy.CheckMethod();
                proxy.CheckMethod2();

                IClientChannel comm = proxy as IClientChannel;

                try
                {
                    comm.Close();
                }
                catch
                {
                    comm.Abort();
                    throw;
                }
                finally
                {
                    try
                    {
                        factory.Close();
                    }
                    catch
                    {
                        factory.Abort();
                    }
                }
            }
        }
    }
}