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In a failover configuration, there are two computers running MOVEit Central. At any given time, one of them is the "primary node" and the other is the "secondary node". The primary node is responsible for running all tasks, and for accepting all connections from MOVEit Central Admin users. The secondary node is passive: its only responsibility is to maintain an up-to-date copy of the primary node's settings, and to promote itself to the primary node if the other node fails. The secondary node does not run tasks or allow MOVEit Central Admin to make changes to its configuration.
The secondary node connects to the primary node via the same TCP interface that is used by MOVEit Central Admin. It uses this interface to determine the health of the primary node: if it cannot connect for a few minutes, it will assume that the primary is dead and will become the primary itself. The secondary node also uses this TCP interface to replicate changes on-the-fly from the primary node. Also, both nodes use this interface to ensure that there is exactly one primary node at all times. This prevents a situation in which both nodes are primary, and potentially transferring files twice.
Status information on the failover aspects of the system is available on the Failover tab of MOVEit Central Admin.