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When I initially deployed Back End Server High Availability for Lync 2013 I ran into a number of errors which were essentially being caused by the local Windows Firewall on each node and permissions on the witness file share. To make life easier for next time I drew up this quick Visio diagram as a reference of what is required before being able to deploy SQL mirroring via the Lync 2013 Topology Builder or Management Shell.

Thanks

Jovan

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