ZyXEL Communications ZyWALL USG 20 User Manual page 82

Add a profile for employees to surf only allowed websites.
Enable Content Filter Category Service.
Set action for Unsafe Web Pages to "Warn and Log".
Set action for Managed Web Pages to "Block and Log".
Set action for Unrated Web Pages to "Warn and Log".
Set action When Category Server is Unavailable to "Warn and Log".
Check all the unsafe categories.
Check the managed categories that you don't want employees to surf during
office hours.
Activate the External Database Service. Select managed websites that you
want to prevent the employees from accessing during office hours.
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– ZyWALL USG Support Notes
82