Problem:
After deployed a website on localhost, when visit the web, the following error occurred:
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Error Summary
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
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".
Config File
\\?\D:\CAT\CAT.WebApi\web.config
Requested URL
http://localhost:80/CatService/CatService.svc
Physical Path
D:\CAT\CAT.WebApi\CatService.svc
Logon Method
Not yet determined
Logon User
Not yet determined
Config Source
69: <system.webServer>
70: <modules runAllManagedModulesForAllRequests="true"/>
71: <!--
Screen shot:
Solution:
1. Open control panel, go to “Programs and Features”;
2. Click “Turn Windows features on or off”;
3. On the “Turn Windows features on or off” panel, expand “Internet Information Services”, “World Wide Web Services”, “Application Development Features” in sequence.
4. Check the “ASP.NET” option, the other 3 options “.NET Extensibility”, “ISAPI Extensions”, “ISAPI Filters” would be automatically checked.
5. Click OK, and then revisit the web page, the error is gone.