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Some ASP.net web applications stop working after migrating to IIS 7.0. What should I do?

April 26, 2017applications IIS migrating web working

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Some ASP.net web applications stop working after migrating to IIS 7.0. What should I do?

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IIS 7.0 involves a new integrated pipeline mode of ASP.net which is the default mode for a freshly installed IIS 7.0. This mode’s benefit includes simplifying request processing, extending managed modules usability and improving performance. Most ASP.net applications can work in this new mode without any changes. However, we may still find some ASP.net applications stop working after migrating to IIS 7.0. In such a situation, you should check if the web application run into some breaking changes of the new ASP.net integration mode (see article below). Then apply corresponding solution or work around or consider switching the application pool to classic mode. For example, http modules or http handlers specified in web.config need to be moved to and under in the new integrated mode.