When a schedule is no longer needed for your networks it can be deleted from the list. By removing a maintenance schedule, any network with the associated schedule takes on the settings of the System (Global) maintenance schedule (if one has been previously set).
To remove a scheduled maintenance window,
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From the menu bar, select Tools -> System Administration.
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Next, select Global - > Maintenance Windows.
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Select the schedule (maintenance window), then click Remove. The confirmation window displays.
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If okay, click Yes. Or, to cancel this action, click No.
The Maintenance Window updates with the selected item removed from the list.