wfc with custom authentication

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webservice

Hi I can’t connect to my wfc, it is under SSL, but this is not a problem and I use custom authentication… and here starts my problems.

I connect to wfc:
ServiceReference1.Service1Client g = new ServiceReference1.Service1Client();
g.ClientCredentials.UserName.UserName = "a";
g.ClientCredentials.UserName.UserName = "b";
string a = g.GetData(77);

here my exception

System.ServiceModel.ServiceActivationException

WFC’s web.config is

<system.serviceModel>
    <services>
      <service name="WcfService1.Service1">
        <endpoint address=""
                  binding="basicHttpBinding"
                  bindingConfiguration="secureHttpBinding"
                  contract="WcfService1.IService1"/>

        <endpoint address="mex"
                  binding="mexHttpsBinding"
                  contract="IMetadataExchange" />
      </service>
    </services>
    <bindings>
      
      <basicHttpBinding>
        <binding name="secureHttpBinding">
          <security mode="TransportWithMessageCredential">
            <message clientCredentialType="UserName"/>


          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
          <serviceMetadata httpsGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
          <serviceCredentials>
            <userNameAuthentication  userNamePasswordValidationMode="Custom"
             customUserNamePasswordValidatorType="WcfService1.UsernameAuthentication, WcfService1" />
          </serviceCredentials>
</behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>

Class UsernameAuthentication is:

namespace WcfService1
{
    public class UsernameAuthentication : UserNamePasswordValidator
    {
        public override void Validate(string userName, string password)
        {
            var ok = (userName == "a") && (password == "b");
            ok = true;
            if (ok == false)
                throw new AuthenticationException(" not match");
        }
    }
}

My service is

namespace WcfService1
{
        [ServiceContract]
    
    public interface IService1
    {

        [OperationContract]
        string GetData(int value);
    }
}

can somebody help me?
thanks erika