Software Requirements

The two units in a High Availability configuration must:

• Be in the same firewall mode (routed or transparent).

• Have the same software version.

• Be in the same domain or group on the management center.

• Have the same NTP configuration. See Configure NTP Time Synchronization for Threat Defense.

• Be fully deployed on the management center with no uncommitted changes.

• Not have DHCP or PPPoE configured in any of their interfaces.

• (Firepower 4100/9300) Have the same flow offload mode, either both enabled or both disabled.