While working with Visual Studio if you face this issue then makes sure that you have below setting in your web.config file:
- <system.webServer>
- <validation validateIntegratedModeConfiguration="false"/>
- </system.webServer>
- </configuration>

This blog help you to solve HTTP Error 500.23 - Internal Server Error Local IIS Web Server.
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While working with Visual Studio if you face this issue then makes sure that you have below setting in your web.config file:

Santhakumar MunuswamyPosted Sep 26, 2015, 12:38 PM
Nice share