12.2 URL Rules
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(wildcard matching) to substitute any number of characters (i.e. *.kerio.com*)
Server names represent any URL at a corresponding server (www.kerio.com/*).
•is in URL group — selection of a URL group (refer to chapter 14.4) which the URL
should match with
•is rated by Kerio Web Filter rating system — the rule will be applied on all pages
matched with a selected category by the Kerio Web Filter module.
Click on the Select Rating... button to select from Kerio Web Filter categories. For
details, refer to chapter 12.3.
•is any URL where server is given as IP address — by enabling this option users
will not be able to bypass URL based filters by connecting to Web sites by IP
address rather than domain name. This trick is often used by servers offering
illegal downloads.
Warning
If access to servers specified by IP addresses is not denied, users can bypass URL
rules where servers are specified by names.
Action
Selection of an action that will be taken whenever a user accesses a URL meeting a rule:
•Allow access to the Web site
•Deny access to the Web site — requested page will be blocked. The user will be
informed that the access is denied or a blank page will be displayed (according
to settings in the Advanced tab — see below).
Tick the Log option to log all pages meeting this rule in the Filter log (see chapter 22.9).
Go to the Advanced tab to define more conditions for the rule or/and to set options for denied
pages.
Valid at time interval
Selection of the time interval during which the rule will be valid (apart from this inter-
val the rule will be ignored). Use the Edit button to edit time intervals (for details see
chapter 14.2).
Valid for IP address group
Selection of IP address group on which the rule will be applied. Client (source) addresses
are considered. Use the Any option to make the rule independent of clients.
Click on the Edit button to edit IP groups (for details see chapter 14.1).
Valid if MIME type is
The rule will be valid for a certain MIME type only (for example, text/html — HTML
documents, image/jpeg — images in the JPEG format, etc.).
You can either select one of the predefined MIME types or define a new one. An asterisk
substitutes any subtype (i.e. image/*). An asterisk stands for any MIME type — the rule
will be independent of the MIME type.