Contract requires duplex, but binding 'custombinding' doesn't support it or isn't configured properly to support it

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WCF

Contract requires Duplex, but Binding 'CustomBinding' doesn't support it or isn't configured properly to support it

What I have tried:

I got above error while accessing the WCF service using proxy, any one can suggest what the error or cofiguration required in my web.config fileor something else be needed.

below client configuration code snippet.


<pre><system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_ILoginServer" />
      </basicHttpBinding>
      <customBinding>
        <binding name="PollingDuplexHttpBinding_IDialServer">
          <binaryMessageEncoding />
          <httpTransport />
        </binding>
      </customBinding>
      <netTcpBinding>
        <binding name="NetTcpBinding_IDialServer">
          <security mode="None" />
        </binding>
      </netTcpBinding>
    </bindings>

    <client>
      <endpoint address="http://XXX.XXX.XX.XX:8086/LoginServer" binding="basicHttpBinding"
        bindingConfiguration="BasicHttpBinding_ILoginServer" contract="LoginServerRef.ILoginServer"
        name="BasicHttpBinding_ILoginServer" />
      <endpoint address="http://XXX.XXX.XX.XX:8084/DialServer" binding="customBinding"
        bindingConfiguration="PollingDuplexHttpBinding_IDialServer"
        contract="DialServerRef.IDialServer" name="PollingDuplexHttpBinding_IDialServer" />
      <endpoint address="net.tcp://localhost:8085/DialServer" binding="netTcpBinding"
        bindingConfiguration="NetTcpBinding_IDialServer" contract="DialServerRef.IDialServer"
        name="NetTcpBinding_IDialServer" />    
    </client>
  </system.serviceModel>

Below code for accessing methods.

public static IDialServer Proxy
{
get
{
var ctx = new InstanceContext(new TestServiceCallBack());
return new DuplexChannelFactory<idialserver>
(ctx, "WSDualHttpBinding_INotificationServices").CreateChannel();
}
}


static void Main(string[] args)
{
// Proxy.RegisterAgent(5,1)
Console.ReadLine();
}

public class TestServiceCallBack : IDialServer
{
}
Please suggest if i am doing wrong or something else.