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These errors occur due to changes in how some ASP.NET configuration is applied in Integrated mode.

If you require more information on a particular problem, please post a question on the IIS.NET forums. Where available, I include links to blog posts that contain additional details and workaround information. For more information about moving to Classic mode, see: Changing the ASP.NET integration mode.īelow, I discuss some of the breaking changes in detail. Use Classic mode as a last resort if you cannot apply the specified workaround. Moving to Classic mode will make your application unable to take advantage of ASP.NET improvements made possible in Integrated mode, leveraging future features from both Microsoft and third parties that may require the Integrated mode. However, we strongly recommend that you use a workaround where available to change your application to work in Integrated mode instead.

IIS 7.0 and above also offers the ability to run ASP.NET applications using the legacy Classic ASP.NET Integration mode, which works the same way as ASP.NET has worked on previous versions of IIS. Except where noted, these breaking changes occur only when using the default ASP.NET Integrated mode. This article lists the changes in behavior that you may encounter when deploying your ASP.NET applications on IIS 7.0 and above on Windows Vista SP1 and Windows Server 2008. As a result, most ASP.NET applications should work without change. This was a major challenge for us as we re-architected the entire core engine of ASP.NET, and in the end we were highly successful in meeting it. While making ASP.NET applications more powerful in IIS 7.0 and above, we also worked diligently to ensure that existing ASP.NET applications continue to work when migrated to this new platform. For more information about the ASP.NET Integration in IIS, see: ASP.NET Integration with IIS7 and Above. This new mode enables a myriad of exciting scenarios, including using valuable ASP.NET features such as Forms Authentication for your entire Web site, and developing new ASP.NET modules to do things such as URL rewriting, authorization, logging, and more at the IIS level.

ASP.NET 2.0 applications on IIS 7.0 and above are hosted using the ASP.NET Integrated mode by default.