Chapter 27 Content Filtering
USG20(W)-VPN Series User’s Guide
423
Action for Managed Web
Pages
Select
Pass
to allow users to access web pages that match the other
categories that you select below.
Select
Block
to prevent users from accessing web pages that match the other
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 web pages that match the other
categories that you select below.
Action for Unrated Web
Pages
Select
Pass
to allow users to access web pages that the external web filtering
service has not categorized.
Select
Block
to prevent users from accessing web pages that the external web
filtering service 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
Warn
to display a warning message before allowing users to access
web pages that the external web filtering service has not categorized.
Select
Log
to record attempts to access web pages that are not categorized.
Action When Category
Server Is Unavailable
Select
Pass
to allow users to access any requested web page if the external
content filtering database is unavailable.
Select
Block
to block access to any requested web page if the external
content filtering database is unavailable.
Select
Warn
to display a warning message before allowing users to access any
requested web page if the external content filtering database is unavailable.
The following are possible causes for the external content filtering server not
being available:
•
There is no response from the external content filtering server within the
time period specified in the
Content Filter Server Unavailable Timeout
field.
•
The USG 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.
Select Categories
Select All Categories
Select this check box to restrict access to all site categories listed below.
Clear All Categories
Select this check box to clear the selected categories below.
Security Threat (unsafe)
Theese are the categories of web pages that are known to pose a threat to
users or their computers.
Anonymizers
Sites and proxies that act as an intermediary for surfing to other Web sites in
an anonymous fashion, whether to circumvent Web filtering or for other
reasons. For example, blog.go2.tw, anonymizer.com, www.qu365.com.
Botnets
Sites that use bots (zombies) including command-and-control sites.
Compromised
Sites that have been compromised by someone other than the site owner in
order to install malicious programs without the user's knowledge. Includes
sites that may be vulnerable to a particular high-risk attack. For example,
www.wokoo.net, movie.sx.zj.cn.
Table 164
Configuration > UTM Profile> Content Filter > Profile > Add > Category Service
LABEL
DESCRIPTION
Summary of Contents for ZyWall USG20-VPN
Page 17: ...17 PART I User s Guide ...
Page 18: ...18 ...
Page 99: ...99 PART II Technical Reference ...
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