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As you make changes to appliance parameters in the management tool, these changes are tracked and accumulated in a buffer until you either apply or cancel them. You can make changes in multiple tabs and wait to apply them all at once.
This does not apply to the Actions and Date/Time tabs. Changes in these tabs are immediately effective. If you change the NTP server, the appliance time will change with the next synchronization cycle (normally about 15 minutes).
Except in the cases just mentioned, clicking Apply commits all changes made in any tab since the last time you started the appliance or clicked Cancel. Clicking Cancel cancels all changes made since the last time you started the appliance or clicked Apply. Clicking Cancel is also a quick way of requesting that the appliance reread the currently displayed settings.
Once you click Apply or Cancel, the action cannot be undone.
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