I plan as for the previous updates to broke the Master/Slave team, upgrade the slave appliance, point my PC to it for testing, test NTLMv2 auth, change DNS entry of the primary to the secondary so proxy.pac allways point to the secondary, upgrade the primary, test, rejoin the team, change DNS back.
Normally, no noticable downtime
Evidently, full backup of both appliance before and after the procedure...
And also, from previous experience, burn a DVD with the image need to reimage the appliance to the previous version just in case...
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