Active Directory groups do not appear in security configuration

Overview:
When trying to search Active Directory, this message appeared in the REST Manager logs:
 

?Claim resolution failed: System.DirectoryServices.DirectoryServicesCOMException (0x80072020): An operations error occurred.  at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)  at System.DirectoryServices.DirectoryEntry.Bind()  at System.DirectoryServices.DirectoryEntry.get_AdsObject()  at System.DirectoryServices.DirectorySearcher.FindAll(Boolean findMoreThanOne)  at Geocortex.Core.Security.Integration.Windows.SearcherDetails.FindClaims(IObserver`1 observer, CancellationToken cancellationToken, String type, String searchTerms) Claim resolution failed: System.DirectoryServices.DirectoryServicesCOMException (0x80072020): An operations error occurred.  at System.DirectoryServices.SearchResultCollection.ResultsEnumerator.MoveNext()  at Geocortex.Core.Security.Integration.Windows.SearcherDetails.FindClaims(IObserver`1 observer, CancellationToken cancellationToken, String type, String searchTerms)

 

Solution:

To resolve this issue,  configure the Essentials Manager and REST applications to run as the "NETWORK SERVICE" identity instead of ApplicationPoolIdentity.