how configure wcf support faultcontracts where both horde fan same slight controlling net.pipe?

i'm perplexing emanate an in-process section exam use fan interactions controlling net.pipe binding. good wcf use uses faultcontractattribute use operations arrangement illusory faults (wrapped exceptions) metadata. i have fan use endpoints configured thru xml (app.config). however, whenever error thrown, it's only communicationexception "pipe closed", typed error i expecting.

system.servicemodel.communicationexception: there an blunder reading pipe: summons ended. (109, 0x6d). 

i attempted adding imetadataexchange endpoint net.pipe, nonetheless didn't work. i also attempted . being perspective mandatory me netsh acl http endpoint. too work.

the tradition difference class:

public category validationexception : applicationexception { }

this latest try during config, nonetheless pumps out "the agreement name 'imetadataexchange' found list contracts implemented service"

any links examples recommendations finished appreciated.

<system.servicemodel>

  <client>
    <endpoint name="client"
              contract="iservice"
              address="net.pipe://localhost/servicetest/"
              binding="netnamedpipebinding"
              bindingconfiguration="netpipebindingconfig" />
  </client>

  <services>
    <service
      name="service"
      behaviorconfiguration="servicefaults">
      <host>
        <baseaddresses>
          <add baseaddress="net.pipe://localhost/servicetest/"/>
          <add baseaddress="http://localhost/servicetest/"/>
        </baseaddresses>
      </host>
      <endpoint
        address=""
        binding="netnamedpipebinding"
        bindingconfiguration="netpipebindingconfig"

        name="servicepipe"
        contract="iservice" />
      <endpoint
        address="mex"
        binding="mexnamedpipebinding"
        bindingconfiguration="mexnetpipebindingconfig"
        name="mexuserservicepipe"
        contract="imetadataexchange" />
    </service>
  </services>

  <bindings>
    <netnamedpipebinding>
      <binding name="netpipebindingconfig"
               closetimeout="00:30:00"
               sendtimeout="00:30:00" />
    </netnamedpipebinding>
    <mexnamedpipebinding>
      <binding name="mexnetpipebindingconfig"></binding>
    </mexnamedpipebinding>
  </bindings>

  <behaviors>
    <servicebehaviors>
      <behavior name="servicefaults">
        <servicedebug includeexceptiondetailinfaults="true"/>
      </behavior>
      <behavior name="mex">
        <servicemetadata 
          httpgetenabled="true"
          httpgeturl="http://localhost/servicetest/mex"/>
      </behavior>
    </servicebehaviors>
  </behaviors>

</system.servicemodel>