Required for the SharePoint 2010 User Profile Syncronisation service when the the FQDN and NETBIOS names for the windows domain are different.
These steps must be completed by an Enterprise Administrator.
1. Open ADSIEdit.msc
2. Connect to the Configuration Partition as shown
3. Right click the configuration partition and choose properties
4. From the Security tab, add the User Profile Directory Sync account user and give it Replicating Directory Changes permissions