On FortiGate 120G and 121G models in an HA cluster, if the ha or mgmt interface is used as the heartbeat interface, the HA cluster may not synchronize and the GUI HA page may not load. On the FortiGate 120G and 121G, HA did not synchronize and the GUI HA page stuck loading when ha or mgmt interfaces used as the heartbeat interface.Workaround: do not use ha or mgmt interfaces as the heartbeat interface. On FortiGate 120G, and 121G models in an HA cluster, if the ha or mgmt interface is used as the heartbeat interface, the HA cluster may not synchronize and the GUI HA page may not load.Workaround: do not use ha or mgmt interface as heartbeat interface.