http://www.tuicool.com/articles/ZJ7F3aV
HTTP Error 500.19 – Internal Server Error – 0x80070021 (IIS 8.5)
I started getting below error in a fresh box where I have got windows 8.1 and Visual Studio 2013,
HTTP Error 500.19 – Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.
| Module | IIS Web Core |
|---|---|
| Notification | BeginRequest |
| Handler | Not yet determined |
| Error Code | 0x80070021 |
| Config Error | This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault=”Deny”), or set explicitly by a location tag with overrideMode=”Deny” or the legacy allowOverride=”false”. |

To resolve the above I just enabled the Application Development Features under Word Wide Service as shown below

I hope this might help you.

本文详细介绍了如何解决在安装了Windows 8.1和Visual Studio 2013的环境中遇到的HTTP错误500.19问题。主要涉及配置数据无效导致的内部服务器错误,并提供了通过启用应用开发功能来解决问题的方法。
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