Posted November 28, 20231 yr Issue: IIS manager GUI not working. When user is opening up IIS manager and trying to browse the application pools then we are getting below error message. "Method not found: Microsoft.Web.Administration.StartModeMicrosoft.Web.Administration.ApplicationPool.get_StartMode()". Cause: Server is loading older version of "Microsoft.Web.Administration.dll" from C:\Windows\assembly\GAC_MSIL\Microsoft.Web.Administration\7.0.0.0__31bf3856ad364e35 GAC folder. Resolution: Please take the backup of C:\Windows\assembly\GAC_MSIL\Microsoft.Web.Administration\7.0.0.0__31bf3856ad364e35 folder. After that copy "C:\Windows\System32\inetsrv\Microsoft.Web.Administration.dll" dll and paste it into C:\Windows\assembly\GAC_MSIL\Microsoft.Web.Administration\7.0.0.0__31bf3856ad364e35 folder. After that you should be able to browse the Application Pool in IIS Manager. Continue reading...
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