This update procedure is only valid for upgrading from FortiWeb 4.0 MR4 or newer. If you are upgrading from FortiWeb 4.0 MR3, for example, the active appliance will not automatically send the new firmware to the standby; you must quickly connect to the standby and manually install the new firmware while the originally active appliance is upgrading and rebooting. Alternatively, switch the appliances out of HA mode, upgrade them individually, then switch them back into HA mode. |
If downgrading to a previous version, do not use this procedure. The HA daemon on the standby appliance might detect that the main appliance has older firmware, and attempt to upgrade it to bring it into sync, undoing your downgrade. Instead, switch out of HA, downgrade each appliance individually, then switch them back into HA mode. |
If required ports are not available, HA port monitoring could inadvertently trigger an additional failover and traffic interruption during the firmware update. |
Closing your browser window or using the back or forward buttons can interrupt the upgrade process, resulting in a split brain problem — both the upgrade of the initial master and HA will be interrupted, because both appliances will believe they are the main appliance. |