Looking for help from Customers of the Adaxes software that have fixed this issue.
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:\Program Files\Softerra\Adaxes 3\Web Interface\App\web.config
Requested URL https://adaxes.com:443/Adaxes
Physical Path C:\Program Files\Softerra\Adaxes 3\Web Interface\App
Logon Method Not yet determined
Logon User Not yet determined
Config Source:
35: <validation validateIntegratedModeConfiguration="false"/>
36: <handlers>
37: <remove name="WebDAV"/>