WCF 提示未能调用服务

在WcfTestClient中测试WCF时遇到下列提示：
未能调用服务。可能的原因: 服务已脱机或无法访问；客户端配置与代理不匹配；现有的代理无效。有关详细信息，请参阅堆栈跟踪。可以尝试通过启动新的代理、还原到默认配置或刷新服务来恢复。

以下是我的Web.Config文件：



<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <system.serviceModel>

    <services>

      <!--添加服务-->      

      <service name="MyServices.UserService" behaviorConfiguration="UserServiceBehavior">        

        <endpoint address="http://localhost:8000/UserService"   binding="wsHttpBinding" contract="MyServices.IUserService"></endpoint>        

      </service>



      <service name="MyServices.ArticleService" behaviorConfiguration="ArticleServiceBehavior">

        <endpoint address="http://localhost:8000/ArticleService"   binding="wsHttpBinding" contract="MyServices.IArticleService"></endpoint>

      </service>



    </services>

    <!--定义CalculatorServiceBehavior的行为-->

    <behaviors>

      <serviceBehaviors>

        <behavior name="UserServiceBehavior">

          <serviceMetadata httpGetEnabled="true" httpGetUrl="http://localhost:8000/UserService"/>

          <serviceDebug includeExceptionDetailInFaults="true"/>

        </behavior>

        <behavior name="ArticleServiceBehavior">

          <serviceMetadata httpGetEnabled="true" httpGetUrl="http://localhost:8000/ArticleService/mex/"/>

          <serviceDebug includeExceptionDetailInFaults="true"/>

        </behavior>

      </serviceBehaviors>

    </behaviors>

  </system.serviceModel>

</configuration>

--------------------编程问答-------------------- 将你WCF所在的web项目发布到IIS中去，然后去掉端口号：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <services>
      
      <service name="MyServices.UserService" behaviorConfiguration="UserServiceBehavior">
        <endpoint address="../UserService"   binding="wsHttpBinding" contract="MyServices.IUserService"></endpoint>
      </service>

      <service name="MyServices.ArticleService" behaviorConfiguration="ArticleServiceBehavior">
        <endpoint address="../ArticleService"   binding="wsHttpBinding" contract="MyServices.IArticleService"></endpoint>
      </service>

    </services>
    
    <behaviors>
      <serviceBehaviors>
        <behavior name="UserServiceBehavior">
          <serviceMetadata httpGetEnabled="true" httpGetUrl="../UserService"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
        <behavior name="ArticleServiceBehavior">
          <serviceMetadata httpGetEnabled="true" httpGetUrl="../ArticleService/mex/"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

补充：.NET技术 ,  Web Services