HTTP Error 500.23 - Internal Server Error

An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.

  This error is because of configuration in the system.web > httpHandlers section. To fix this while maintaining integrated mode, add the following markup to your application's web.config in the configuration section:


              <validation validateIntegratedModeConfiguration="false"/>

Adding <validation validateIntegratedModeConfiguration="false"/> addresses the symptom, but is not appropriate for all circumstances. Having ran around this issue a few times, I hope to help others not only overcome the problem but understand it.

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