应用补丁后SSRS Report Manager报Http 500：重复mscorlib引用问题求助

碰到过好几起类似的SSRS补丁后程序集冲突问题，给你几个经过验证的排查修复方向，按优先级来试：

1. 检查Report Manager的web.config重复引用 #

先找到SSRS安装目录下的ReportManager文件夹（默认路径一般是C:\Program Files\Microsoft SQL Server\MSRS11.MSSQLSERVER\Reporting Services\ReportManager），打开里面的web.config：

• 搜索<assemblies>节点，看看是不是同时添加了多个mscorlib的引用（比如既有2.0版本又有4.x版本）
• 如果发现重复项，删掉多余的那一行（SQL Server 2012依赖.NET 4.x，通常移除2.0的重复引用即可）
• 保存文件后重启SSRS服务，测试Report Manager是否恢复

2. 验证GAC中的mscorlib版本 #

以管理员身份打开命令提示符，运行gacutil -l mscorlib查看全局程序集缓存里的版本：

• 确认有没有多个2.0.0.0版本的mscorlib存在，或者版本信息异常
• 如果发现异常，重新注册正确版本：运行gacutil -i "C:\Windows\Microsoft.NET\Framework\v2.0.50727\mscorlib.dll"（32位）或Framework64下的对应文件（64位系统），之后重启服务

3. 修复SSRS安装 #

补丁安装偶尔会损坏SSRS的文件或配置，试试修复：

• 打开控制面板→程序和功能，找到Microsoft SQL Server 2012，右键选“更改”
• 在安装向导里选择“修复”，跟着提示走完流程
• 修复完成后重启SSRS服务，再检查Report Manager状态

4. 排查.NET Framework兼容性 #

SQL Server 2012依赖.NET Framework 4.x，补丁可能影响了.NET的配置：

• 检查服务器上的.NET Framework 4.x是否完整，有没有缺失的更新
• 运行.NET Framework修复工具（本地下载运行即可）修复可能的损坏
• 修复后重启服务器，再测试SSRS

5. 回滚最近的补丁（最后手段） #

如果以上方法都没用，说明补丁和当前SSRS版本存在兼容性问题：

• 打开控制面板→程序和功能→查看已安装的更新
• 找到最近安装的SQL Server或Windows补丁，右键卸载
• 卸载完成后重启服务器，确认SSRS是否恢复正常

附你提供的错误日志（方便后续排查参考） #

appdomainmanager!DefaultDomain!532c!01/19/2018-09:52:54:: e ERROR: AppDomain ReportManager_MSSQLSERVER_0 failed to start. Error: (0): error CS1703: An assembly with the same identity 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' has already been imported. Try removing one of the duplicate references.
library!DefaultDomain!532c!01/19/2018-09:52:54:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerHttpRuntimeInternalException: Failed to create HTTP Runtime, Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerHttpRuntimeInternalException: An internal or system error occurred in the HTTP Runtime object for application domain ReportManager_MSSQLSERVER_0. ---> System.Web.HttpCompileException: (0): error CS1703: An assembly with the same identity 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' has already been imported. Try removing one of the duplicate references.
   at System.Web.Compilation.AssemblyBuilder.Compile()
   at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
   at System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp)
   at System.Web.Compilation.BuildManager.CompileGlobalAsax()
   at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled()
   at System.Web.Compilation.BuildManager.CallAppInitializeMethod()
   at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironment(String appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironmentAndReportErrors(String appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.ApplicationManager.GetAppDomainWithHostingEnvironment(String appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.ApplicationManager.CreateObjectInternal(String appId, Type type, IApplicationHost appHost, Boolean failIfExists, HostingEnvironmentParameters hostingParameters)
   at System.Web.Hosting.ApplicationManager.CreateObject(String appId, Type type, String virtualPath, String physicalPath, Boolean failIfExists, Boolean throwOnError)
   at ReportingServicesHttpRuntime.RsHttpRuntime.Create(RsAppDomainType type, String vdir, String pdir, Int32& domainId)
--- End of inner exception stack trace ---
; appdomainmanager!ReportManager_0-8!532c!01/19/2018-09:52:54:: i INFO: Appdomain:10 ReportManager_MSSQLSERVER_0-8-131608291715600412 unloading
library!DefaultDomain!532c!01/19/2018-09:52:54:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerAppDomainManagerException: Failed to create Report Server HTTP Runtime, Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerAppDomainManagerException: An error occurred when attempting to start the application domain ReportManager within the Report Server service. ---> Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerHttpRuntimeInternalException: An internal or system error occurred in the HTTP Runtime object for application domain ReportManager_MSSQLSERVER_0. ---> System.Web.HttpCompileException: (0): error CS1703: An assembly with the same identity 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' has already been imported. Try removing one of the duplicate references.
--- End of inner exception stack trace ---
; rshost!rshost!532c!01/19/2018-09:52:54:: e ERROR: Failed to create HttpRuntime 80131500.
rshost!rshost!532c!01/19/2018-09:52:54:: e ERROR: Failed to get appdomain 80131500, pipeline=0x00000006483F3C20.
rshost!rshost!532c!01/19/2018-09:52:54:: e ERROR: Error state. Internal abort for pipeline=0x00000006483F3C20 ...
appdomainmanager!DefaultDomain!5090!01/19/2018-09:53:09:: i INFO: Appdomain:10 ReportManager_MSSQLSERVER_0-8-131608291715600412 unregistered.

内容的提问来源于stack exchange，提问作者PieF