To unassign devices from a DNS filter:
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Go to Configure> Firewall Policy>
DNS Filter.
The DNS Filter page is displayed.
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Select the filter to which you want to unassign the devices, click
More, and then click Unassign
Devices.
You are prompted to confirm that you want to unassign the devices.
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Click Yes to confirm.
All the devices assigned to the DNS filter are unassigned.