没有地址是mex的 endpoint 

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="ExposeMetaDataBehavior">
          <serviceMetadata httpGetEnabled="true" httpGetUrl="http://localhost:9876/DeviceManagement/metadata" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <bindings>
      <ws2007HttpBinding>
        <binding name="NewBinding0" />
      </ws2007HttpBinding>
    </bindings>
    <services>
      <service behaviorConfiguration="ExposeMetaDataBehavior" name="DeviceManagementService.DeviceManageImplementation">

        <endpoint address="http://localhost:9876/DeviceManagementService"
            binding="ws2007HttpBinding" bindingConfiguration="NewBinding0"
            contract="DeviceManagementInterface.IDeviceManagement" />

<endpoint address="http://localhost:9876/DeviceManagementService/mex" binding="ws2007HttpBinding" bindingConfiguration="NewBinding0" contract="DeviceManagementInterface.IDeviceManagement" />

 </service> </services> </system.serviceModel> </configuration>