WCF Metadata contains a reference that cannot be resolved

Question

I've spent a couple of hours searching about this error, and I have tested almost everything it's on Google.

I want to access a service using TCP, .NET4 and VS2010, in C#.

I Have a very tiny service:

---

namespace WcfService_using_callbacks_via_tcp
{
    [ServiceContract(CallbackContract = typeof(ICallback), SessionMode = SessionMode.Required)]
    public interface IService1
    {
        [OperationContract]
        string Test(int value);
    }

    public interface ICallback
    {
        [OperationContract(IsOneWay = true)]
        void ServerToClient(string sms);
    }
    [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]
    public class Service1 : IService1
    {
        public string Test(int value)
        {
            ICallback the_callback = OperationContext.Current.GetCallbackChannel<ICallback>();
            the_callback.ServerToClient("Callback from server, waiting 1s to return value.");
            Thread.Sleep(1000);
            return string.Format("You entered: {0}", value);
        }

    }
}

---

With this Web.config:

---

<?xml version="1.0"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
    <services>
      <service name="WcfService_using_callbacks_via_tcp.Service1" behaviorConfiguration="Behaviour_Service1">
        <host>
          <baseAddresses>
            <add baseAddress="net.tcp://localhost:5050/Service1" />
          </baseAddresses>
        </host>
        <endpoint address="" binding="netTcpBinding" bindingConfiguration="DuplexNetTcpBinding_IService1" contract="WcfService_using_callbacks_via_tcp.IService1"/>
        <endpoint address="mex" binding="mexTcpBinding" bindingConfiguration="mexTcp" contract="IMetadataExchange"/>
      </service>
    </services>

    <bindings>
      <!--
        TCP Binding
      -->
      <netTcpBinding>
        <binding name="DuplexNetTcpBinding_IService1" sendTimeout="00:00:01"
                 portSharingEnabled="true">

        </binding>

        <binding name="mexTcp" portSharingEnabled="true">
          <security mode="None" />
        </binding>
      </netTcpBinding>


    </bindings>

    <behaviors>
      <serviceBehaviors>
        <!--
          Behaviour to avoid a rush of clients and to expose metadata over tcp
        -->
        <behavior name="Behaviour_Service1">
          <serviceThrottling maxConcurrentSessions="10000"/>
          <serviceMetadata httpGetEnabled="true"/>
        </behavior>

        <behavior>
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
 <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>

</configuration>

---

And this code to host it:

---

static void Main(string[] args)
{
    Uri base_address = new Uri("net.tcp://localhost:5050/Service1");
    ServiceHost host = null;
    try
    {
        // Create the server
        host = new ServiceHost(typeof(Service1), base_address);
        // Start the server
        host.Open();
        // Notify it
        Console.WriteLine("The service is ready at {0}", base_address);
        // Allow close the server
        Console.WriteLine("Press <Enter> to stop the service.");
        Console.ReadLine();
        // Close it
        host.Close();
    }
    catch (Exception ex)
    {
        // Opus an error occurred
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine(string.Format("Host error:\r\n{0}:\r\n{1}", ex.GetType(), ex.Message));
        Console.ReadLine();
    }finally
    {
        // Correct memory clean
        if(host != null)
            ((IDisposable)host).Dispose();
    }
}

---

Now I want to create the client, but I it is not posible. I've used Add Service Reference and svcutil directly, but I am receiving this error:

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C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC>svcutil.exe net.tcp://loc alhost:5050/Service1 Microsoft (R) Service Model Metadata Tool [Microsoft (R) Windows (R) Communication Foundation, Version 4.0.30319.1] Copyright (c) Microsoft Corporation. All rights reserved.

Attempting to download metadata from 'net.tcp://localhost:5050/Service1' using W S-Metadata Exchange. This URL does not support DISCO. Microsoft (R) Service Model Metadata Tool [Microsoft (R) Windows (R) Communication Foundation, Version 4.0.30319.1] Copyright (c) Microsoft Corporation. All rights reserved.

Error: Cannot obtain Metadata from net.tcp://localhost:5050/Service1

If this is a Windows (R) Communication Foundation service to which you have acce ss, please check that you have enabled metadata publishing at the specified addr ess. For help enabling metadata publishing, please refer to the MSDN documentat ion at http://go.microsoft.com/fwlink/?LinkId=65455.

WS-Metadata Exchange Error URI: net.tcp://localhost:5050/Service1

Metadata contains a reference that cannot be resolved: 'net.tcp://localhost: 5050/Service1'.

The socket connection was aborted. This could be caused by an error processi ng your message or a receive timeout being exceeded by the remote host, or an un derlying network resource issue. Local socket timeout was '00:04:59.9863281'.

Se ha forzado la interrupción de una conexión existente por el host remoto

If you would like more help, type "svcutil /?"

---

So, I can host the service without problems but I can not create the proxies.

I've tried almost any config I've found, but I think the current web.config is correct. There are the behaviours, the security, and the bindings using mex, used by the endpoints.

I've tried to create an app.config and set it to the same folder with svcutil.exe.

Answer 1

I received the same error while attempting to update an existing service reference. It turns out I had data contracts with the same name within the same namespace. Further investigation yielded the real error:

DataContract for type [redacted] cannot be added to DataContractSet since type '[redacted]' with the same data contract name 'DocumentInfo' in namespace '[redacted]' is already present and the contracts are not equivalent.

I changed the DataContract to provide a name for one of the classes.

[DataContract(Namespace = "urn:*[redacted]*:DataContracts", Name = "SC_DocumentInfo")]

I'm posting this here in case it might help someone with the same issue.