You may be able to SSH from the active device to the passive device. I found this out when I didn't want to use the MGMT interfaces. I quickly found out using MGMT interfaces was much, much better.
I think this worked with my PA-200s, because their MGMT port/address is also the HA port/address. This did not work with my PA-3020s which have dedicated HA ports.
For example, if there is a management profile on the inside interface that allows SSH. You can SSH into the active device only using the inside IP. You can then hop into the passive device using the HA peer IP.
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