During an ASP.NET feature set repair routine, the servicing simply calls aspnet_regiis.exe with "-iru" parameters. This routine performs a number of checks and takes certain actions that could possibly change the ASP.NET configuration under very rare circumstances. As mentioned above, this routine will run even if no ASP.NET components are getting updated by the hotfix, and therefore also has the potential to alter some ASP.NET configuration settings. Installation of such a hotfix will also trigger IIS and ASP.NET application domain restarts.
Microsoft recommends that you backup your IIS and ASP.NET configuration files before installing any hotfix that updates Microsoft .NET Framework components.
Article ID: 2307350 - Last Review: Aug 5, 2010 - Revision: 1