HTTP Error 500.19 - Internal Server Error: The requested page cannot be accessed because the related configuration data for the page is invalid.

Problem

After deploy your site on IIS7, you may get the following information:
Module IIS Web Core
Notification BeginRequest
Handler Not yet determined
Error Code 0×80070021
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:\wwwroot\yoursite.com\web.config


Solution

Open IIS Manager, select root node( the hosting server), in the middle panel double click Feature Delegation. In right panel select Custom Site Delegation..., In upper part of middle panel, click the drop down list and select your site. In Action panel click Reset All Delegation.



Other Resources

  1. An Overview of Feature Delegation in IIS 7.0
  2. Delegated Administration


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