访问WCF总是提示未找到终结点是咋回事

访问WCF总是提示未找到终结点是怎么回事？
代码如下：
DMSWcfService.svc
-------------------------------------------------
using System;
using System.Collections.Generic;
using System.Data.Services;
using System.Linq;
using System.ServiceModel.Web;
using System.Web;
using System.ServiceModel.Activation;

namespace Seahisoft.Main.DMSWcfService
{
  [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
  public class ConfigMngService : IConfigMngService
  {
  public string GetData(int value)
  {
  return string.Format("You entered: {0}", value);
  }

  public CompositeType GetDataUsingDataContract(CompositeType composite)
  {
  if (composite.BoolValue)
  {
  composite.StringValue += "Suffix";
  }
  return composite;
  }
  }
}


IConfigMngService.cs
-------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel;
using System.Runtime.Serialization;

namespace Seahisoft.Main.DMSWcfService
{
  // 注意: 如果更改此处的接口名称 "IService1"，也必须更新 Web.config 中对 "IService1" 的引用。
  [ServiceContract]
  public interface IConfigMngService
  {
  [OperationContract]
  string GetData(int value);

  [OperationContract]
  CompositeType GetDataUsingDataContract(CompositeType composite);

  // 任务: 在此处添加服务操作
  }
}


Web.config
-------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<!--
  注意: 除了手动编辑此文件以外， 
  还可以使用 Web 管理工具来配置应用程序的设置。
  可以使用 Visual Studio 中的“网站”->“Asp.Net 配置”选项。
  设置和注释的完整列表在 
  machine.config.comments 中，该文件通常位于 
  \Windows\Microsoft.Net\Framework\v2.x\Config 
-->
<configuration>
  <configSections>
  <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
  <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
  <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
  <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
  <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere" />
  <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />