WatchGuard Technologies SOHO - Manual (Page 86)

How WebBlocker works
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site, the SOHO queries the WatchGuard database and determines
whether or not to block the site. The SOHO considers the following
conditions in determining whether or not to block the site:
Web site not in WebBlocker database
If the site is not in the WatchGuard WebBlocker database, the Web
browser opens the page for viewing.
Web site in WebBlocker database
If the site is in the WatchGuard WebBlocker database, the SOHO
checks whether or not you have chosen to block that type (or
category) of site. When the category is blocked, the browser
displays a page informing the user that the site is unavailable for
viewing. If the category is not blocked, the Web browser opens the
page for viewing.
WatchGuard WebBlocker database unavailable
If for any reason the WatchGuard WebBlocker database is
unavailable (for example, if there is briefly a problem between
your ISP and the nearest WatchGuard server), the browser
displays a page informing the user that the site is unavailable for
viewing.
WebBlocker Users and Groups
Groups
This feature allows you to create a group and prescribe a
given web browsing profile by selecting the WebBlocker
categories you want to prevent members of this group from
browsing over the internet.