Administrator's Guide - Kerio Software Archive
Administrator's Guide - Kerio Software Archive Administrator's Guide - Kerio Software Archive
HTTP and FTP filtering The is rated by Kerio Web Filter rating system is considered the key parameter. The URL of each opened page will be rated by the Kerio Web Filter module. Access to each page matching with a rating category included in the database will be denied. Use the Select Rating button to open a dialog where Kerio Web Filter rating categories can be chosen. Select the Job Search / Job offers rating category (pages including job offers). Figure 13.8 Selection of Kerio Web Filter categories Note: 1. You can define multiple URL rules that will use the Kerio Web Filter rating technology. Multiple categories may be used for each rule. 2. We recommend you to unlock rules that use the Kerio Web Filter rating system (the Users can Unlock this rule option in the Advanced tab). This option will allow users to unlock pages blocked for incorrect classification. All unlock queries are logged into the Filter log — here you can monitor whether unlock queries were appropriate or not. 180
13.4 Web content filtering by word occurrence 13.4 Web content filtering by word occurrence Kerio Control can also filter web pages that include undesirable words. This is the filtering principle: Denied words are matched with values, called weight (represented by a whole positive integer). Weights of these words contained in a required page are summed (weight of each word is counted only once regardless of how many times the word is included in the page). If the total weight exceeds the defined limit (so called threshold value), the page is blocked. So called forbidden words are used to filter out web pages containing undesirable words. URL rules (see chapter 13.2) define how pages including forbidden content will be handled. Warning: Definition of forbidden words and threshold value is ineffective unless corresponding URL rules are set! Definition of rules filtering by word occurrence First, suppose that some forbidden words have been already defined and a threshold value has been set (for details, see below). On the URL Rules tab under Configuration → Content Filtering → HTTP Policy, create a rule (or a set of rules) to allow access to the group of web pages which will be filtered by forbidden words. Go to the Content Rules tab under HTTP Rule to enable the web content filter. Take a rule that will filter all web sites by occurrence of forbidden words as an example. • On the General tab, allow all users to access any web site. • On the Content Rules tab, check the Deny Web pages containing... option to enable filtering by word occurrence. 181
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13.4 Web content filtering by word occurrence<br />
13.4 Web content filtering by word occurrence<br />
<strong>Kerio</strong> Control can also filter web pages that include undesirable words.<br />
This is the filtering principle: Denied words are matched with values, called weight<br />
(represented by a whole positive integer). Weights of these words contained in a required<br />
page are summed (weight of each word is counted only once regardless of how many times<br />
the word is included in the page). If the total weight exceeds the defined limit (so called<br />
threshold value), the page is blocked.<br />
So called forbidden words are used to filter out web pages containing undesirable words. URL<br />
rules (see chapter 13.2) define how pages including forbidden content will be handled.<br />
Warning:<br />
Definition of forbidden words and threshold value is ineffective unless corresponding URL<br />
rules are set!<br />
Definition of rules filtering by word occurrence<br />
First, suppose that some forbidden words have been already defined and a threshold value<br />
has been set (for details, see below).<br />
On the URL Rules tab under Configuration → Content Filtering → HTTP Policy, create a rule (or<br />
a set of rules) to allow access to the group of web pages which will be filtered by forbidden<br />
words. Go to the Content Rules tab under HTTP Rule to enable the web content filter.<br />
Take a rule that will filter all web sites by occurrence of forbidden words as an example.<br />
• On the General tab, allow all users to access any web site.<br />
• On the Content Rules tab, check the Deny Web pages containing... option to enable<br />
filtering by word occurrence.<br />
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