Failed to update the list of domains in this forest to synchronize. The error that occurred was %1 (%2) User Replicator has ...

Failed to update the list of domains in this forest to synchronize.  The error that occurred was %1 (%2) User Replicator has a list from a previous cycle, and will continue to use the old list.  If this error continues to occur, it indicates that Lync Server is unable to access the CN=Configuration,CN=Partitions,DC=THIS DOMAIN portion of Active Directory.