When configuring a high-availability (HA) pair, you assign the pair a virtual IP (VIP) address, which enables you to manage the two appliances as if they were a single unit. After you enable high-availability mode, managing the secondary appliance through its IP address is mostly disabled, with most parameters grayed out. A warning message displays the reason on every page. Use the HA VIP for all management tasks. You can, however, disable the secondary appliance's HA state from its management UI.