ZyXEL Communications Internet Security Gateway ZyWALL 2 Series - Manual (Page 187)

ZyWALL 2 Series User’s Guide
Content Filtering Screens 12-7
The following table describes the labels in this screen.
Table 12-2 Content Filter : Categories
LABEL DESCRIPTION
Enable Web Site Auto
Categorization Enable external database content filtering to have the ZyWALL check an
external database to find to which category a requested web page belongs.
The ZyWALL then blocks or forwards access to the web page depending on
the configuration of the rest of this page.
Matched Web Pages Select Block to prevent users from accessing web pages that match the
categories that you select below.
When external database content filtering blocks access to a web page, it
displays the denied access message that you configured in the Content
Filter General screen along with the category of the blocked web page.
Select Log to record attempts to access prohibited web pages.
Unrated Web Pages Select Block to prevent users from accessing web pages that the external
database content filtering has not categorized.
When the external database content filtering blocks access to a web page, it
displays the denied access message that you configured in the Content
Filter General screen along with the category of the blocked web page.
Select Log to record attempts to access web pages that are not categorized.
When Content Filter Server
Is Unavailable
Select Block to block access to any requested web page if the external
content filtering database is unavailable. The following are possible causes:
There is no response from the external content filtering server within
the time period specified in the Content Filter Server Unavailable
Timeout field.
The ZyWALL is not able to resolve the domain name of the external
content filtering database.
There is an error response from the external content filtering database
This can be caused by an expired content filtering registration
(“External content filtering’s license key is invalid”).
Select Log to record attempts to access web pages that occur when the
external content filtering database is unavailable.
Content Filter Server
Unavailable Timeout Specify a number of seconds (1 to 30) for the ZyWALL to wait for a response
from the external content filtering server. If there is still no response by the
time this period expires, the ZyWALL blocks or allows access to the
requested web page based on the setting in the Block When Content Filter
Server Is Unavailable field.