ZyXEL Communications ZyWALL USG FLEX 100 - Configuration on Device 1; Configuration on Device 3

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Configuration on Device 1
Go to Configuration >Device HA>Device HA Pro, Enable Device HA
Make sure the configuration on each field are correct.
(Management IP of active, and passive device, password…)
Next, Press Apply button.
Configuration on Device 3
Go to Configuration >Device HA>Device HA Pro> Tick Enable Configuration
Provisioning From Active Device 1nd Enable Device HA then press Apply