Failed to update the list of domains in this forest to synchronize. User replicator cannot synchronize any users without ...

Lync Server 2010

Failed to update the list of domains in this forest to synchronize. User replicator cannot synchronize any users without knowing which domains to synchronize from.

Cause: This failure occurred because DsGetDcName failed to provide any valid domain controllers to connect to.  User Replicator doesn't have a list from a previous cycle, and cannot proceed. DsGetDcName failures usually stop occurring after some time.
Resolution:
If this error continues to occur, the computer should be rebooted to fix the NetLogon service which services calls to DsGetDcName.

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