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". 


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	\\?\C:\inetpub\wwwroot\web.config
Requested URL	http://localhost:80/
Physical Path	C:\inetpub\wwwroot
Logon Method	Not yet determined
Logon User	Not yet determined
Config Source

   64:     
   65:     
   66:   

Links and 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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SOLUTION 


OPEN C:\Windows\System32\inetsrv\config\applicationHost.config

change overrideModeDefault="Deny" to overrideModeDefault="Allow" 

Change all of the following values located in section  --> 

    
 change this value from "Deny" to "Allow"
    
 change this value from "Deny" to "Allow"