我有3台服务器，所有这些都运行Windows Web Server，.NET 4和IIS7。我的web.config文件的开头部分是：

<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
  <configSections>
    <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings,Microsoft.Practices.EnterpriseLibrary.Logging,Version=4.1.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35" />
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,Microsoft.Practices.Unity.Configuration,Version=2.0.414.0,PublicKeyToken=31bf3856ad364e35" />
    <section name="cachingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings,Microsoft.Practices.EnterpriseLibrary.Caching,PublicKeyToken=31bf3856ad364e35" />
    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup,System.Web.Extensions,Version=3.5.0.0,PublicKeyToken=31BF3856AD364E35">
      <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup,PublicKeyToken=31BF3856AD364E35">
        <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
        <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup,PublicKeyToken=31BF3856AD364E35">
          <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere" />
          <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
          <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
          <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
        </sectionGroup>
      </sectionGroup>
    </sectionGroup>
  </configSections>

@H_404_4@这在2台服务器上工作正常，但其中一个报告错误：

@H_404_4@There is a duplicate ‘system.web.extensions/scripting/scriptResourceHandler’ section defined

@H_404_4@反对：

<section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />

@H_404_4@如果我删除单行，那么它会抱怨下一行的副本，等等，直到我删除几乎所有的配置部分。

@H_404_4@有什么想法会导致什么？

@H_404_4@编辑：

@H_404_4@这是一个更新为VS 2010和.NET 4的.NET 3.5应用程序。所有3台服务器都安装了.NET 2 / 3.5和4。 IIS应用程序池已经更新到.NET 4。

@H_404_4@在所有3台服务器中，machine.config文件中已经定义了一些这样的web.config部分(就像Damien的回答提到的那样)，但是在3个抱怨中只有一个被重复。