I have installed Geocortex Essentials 4.1.0 and configured post-installations. However, when I opened Geocortex Essentials Manager there occurred IIS 7.5 Detailed Error as follows:
HTTP Error 500.19 - Internal Server Error And Error Code 0x80070021: 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".
I have attempted to fix with applicationHost.config file but confusing where to change.