wcf service with transport security - wcf

Question

I've been struggling with following since few days. Please help me. I'm using XP machine with .Net 3.5. I was following this example http://msdn.microsoft.com/en-us/library/ms729789.aspx. I created a certificate using http://msdn.microsoft.com/en-us/library/ms733813(v=vs.90).aspx and imported the root certificate in the Certificate(Local Computer) > Trusted Root Certification Authorities > Certificates and other one in the Certificate(Local Computer) > Personal > Certificates. I've self hosted service. The hosing code is
ServiceHost svcHost = new ServiceHost(typeof(CalculatorService.CalculatorService), new Uri("https://localhost:8012/CalculatorService"));
ServiceMetadataBehavior smb = svcHost.Description.Behaviors.Find<ServiceMetadataBehavior>();
if (smb == null)
smb = new ServiceMetadataBehavior();
smb.HttpsGetEnabled = true;
smb.MetadataExporter.PolicyVersion = PolicyVersion.Policy15;
svcHost.Description.Behaviors.Add(smb);
svcHost.AddServiceEndpoint(ServiceMetadataBehavior.MexContractName,
MetadataExchangeBindings.CreateMexHttpsBinding(),
"mex");
WSHttpBinding b = new WSHttpBinding();
b.Security.Mode= SecurityMode.Transport;
b.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
svcHost.AddServiceEndpoint(typeof(CalculatorService.ICalculator),b , "");
svcHost.Credentials.ServiceCertificate.SetCertificate(StoreLocation.LocalMachine, StoreName.My, X509FindType.FindBySubjectName, "SignedByCA");
svcHost.Open();
Console.WriteLine("The service is ready.");
Console.WriteLine("Press <ENTER> to terminate service.");
Console.WriteLine();
Console.ReadLine();
svcHost.Close();
When I try to add reference in the client I get the following error.
There was an error downloading 'https://localhost:8012/CalculatorService/mex'.
The underlying connection was closed: An unexpected error occurred on a send.
Authentication failed because the remote party has closed the transport stream.
Metadata contains a reference that cannot be resolved: 'https://localhost:8012/CalculatorService/mex'.
An error occurred while making the HTTP request to https://localhost:8012/CalculatorService/mex. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server.
The underlying connection was closed: An unexpected error occurred on a send.
Authentication failed because the remote party has closed the transport stream.
If the service is defined in the current solution, try building the solution and adding the service reference again.
I think I've tried all possible ways. Now, I've no clue. Please help me. You're my final resource.