Tool to validate a web.config


Is there a tool that I can use to validate my web.config? The reason I ask is that the file appears to be valid XML and IIS is complaining that file is invalid. No explanation or indication as to why.

Thanks in advance.


HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. Detailed Error Information: Module IIS Web Core Notification Unknown Handler Not yet determined Error Code 0x8007000d Config Error
Config File \?\C:\DignityFiles\Source\simplicity\Simplicity\web.config Requested URL Physical Path
Logon Method Not yet determined Logon User Not yet determined Config Source:

-1: 0:

More Information: This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.

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Screen shot of the IIS Error

Screen shot of the support page

Link to the web.config (Note: sensitive information has been redacted)

asked on Stack Overflow Aug 16, 2017 by Graham Harris • edited Aug 17, 2017 by Graham Harris

1 Answer


I have (eventually) found the answer:

Installing the URL rewrite module fixed my issue.

answered on Stack Overflow Aug 17, 2017 by Graham Harris

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