6.3.3 Setting the system clock
You manage the time at all computers by setting the system clock. Make sure that you do not set the system clock to a time that has already passed (at the level of seconds). HA Monitor uses the system clock to check the integrity of start notification packets for communication between hosts.
You must set the system clock before you start using HA Monitor. If you change the system clock while HA Monitor is running, HA Monitor might erroneously detect a failure, resulting in connection errors between HA Monitors.