Novell ZENworks 10 Configuration Management
A User Source was configured to point to a specific OU in the user source and this was working properly.
If additional OUs were specified in the ZCC for authentication, users in these OUs still could not login.
A LAN trace of the ZCM server revealed that an "LDAP SEARCHREQUEST" was only being performed for the original OUs.
Rebooting the server allowed the newly configured OUs to work properly.