Directory and Resource Administrator 6.x
Directory and Resource Administrator 7.x
Error: ''OnePoint://CN=X-X-X-XX-XXXXXXXXX-XXXXXXXXXX-XXXXXXXXXX-XXXX,CN=ForeignSecurityPrincipals,DC=XXXXXX,DC=XXXXX,DC=com' does not exist'.
Performing a GroupMemberRemove or GroupMemberAdd operation generates an error.
Adding user accounts from an external trusted domain to a group is successful. Trying to remove these members from the group generates an error.
The issue is a known Microsoft issue and results when a Pre-Service Pack 4 hotfix is installed that does not contain the correct version of Ntdsa.dll file.
This issue is detailed in the following Microsoft KB article. This issue is addressed in Windows 2000 Service Pack 4.
Cannot Add a User or Group to a Trusted Domain
To confirm that the issue is the issue detailed in the Microsoft article, try and remove the same user from the group via Active Directory Users and Computers.