Administrator's Guide - Kerio Software Archive

13.3 Content Rating System (Kerio Web Filter)
Use the Enable HTTP Log and Enable Web Log options to enable/disable logging of HTTP
queries (opened web pages) to the HTTP log (see chapter 22.10) and to the Web log (refer to
chapter 22.14).
Log format can be chosen for the Enable HTTP Log item: Apache access log
(http://www.apache.org/) or Squid proxy log (http://www.squid-cache.org/). This may be
important especially when the log would be processed by a specific analysis tool.
Both HTTP and Web logs are enabled by default. The Apache option is selected by default for
its better reference.
Use the Apply filtering rules also for local server to specify whether content filtering rules will
be applied to local WWW servers which are available from the Internet (see chapter 7). This
option is disabled by default — the protocol inspector only scans HTTP protocol syntax and
performs logging of queries ( WWW pages) according to the settings.
13.3 Content Rating System (Kerio Web Filter)
The Kerio Web Filter module enables Kerio Control to rate web page content. Each page
is sorted into predefined categories. Access to the page will be either permitted or denied
according to this classification.
Kerio Web Filter uses a dynamic worldwide database which includes URLs and classification
of web pages. This database is maintained by special servers that perform page ratings.
Whenever a user attempts to access a web page, Kerio Control sends a request on the page
rating. According to the classification of the page the user will be either allowed or denied to
access the page. To speed up URL rating the data that have been once acquired can be stored
in the cache and kept for a certain period.
Note: A special license is bound with Kerio Web Filter (subscription). Unless Kerio Control
includes subscription for this module, the module behaves as a trial version only (this means
that it is automatically disabled after 30 days from the Kerio Control installation and options
in the Kerio Web Filter tab will not be available). For detailed information about the licensing
policy, read chapter 44.
Kerio Web Filter configuration
The Kerio Web Filter module can be set and configured through the Kerio Web Filter tab in
Configuration → Content Filtering → HTTP Policy.
Enable Kerio Web Filter
use this option to enable/disable the Kerio Web Filter module for classification of
websites.
If Kerio Web Filter is disabled:
• the other options in the Kerio Web Filter tab are not available,
• all URL rules which use the Kerio Web Filter classification are disabled (for details,
refer to chapter 13.3).
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