They are insisting that for Kerberos Delegation to work, the Tableau Server's service account needs Impersonate privilege (or SA) on the SQL Server. Unfortunately for them, I have configured Kerberos ...
On the back-end I installed two database servers running SQL Server. The idea was to use NLB on the front-end for load balancing and Database Mirroring on the back-end for data protection and failover ...