Failed to create topology watcher. This is usually due to SQL connection failure. Microsoft Lync Server 2013, File Transfer ...

Failed to create topology watcher. This is usually due to SQL connection failure. Microsoft Lync Server 2013, File Transfer Agent will continuously attempt to re-create topology watcher.

While this condition persists, configuration changes will not be delivered to replica machines.
Back-end connection string: 
%1 Exception: 
%2
Cause: Possible issues with back-end database.
Resolution:
Ensure the back-end is functioning correctly.
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