HTTP Error 500.19 - This configuration section cannot be used at this path

Symptoms

When you attempt to access XIA Configuration Server you may see the following error message:

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

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".

Cause

The required roles and features have not been installed on the machine running XIA Configuration Server.

- or -

A configuration section has been locked on the IIS server.

Resolution 1: Roles and Features

Ensure that all roles and features have been installed.

Resolution 2: Check Configuration Section Locking

Open IIS Manager and browse to the Default Web Site.
Go to Management > Configuration Editor.
Select "system.webServer/handlers" in the Section dropdown and "ApplicationHost.config" in the From dropdown.
In the Actions pane click Unlock Section.