Kerio Personal Firewall provides the following ad blocking options:
- Block advertisement
Use this option to block ads according to the defined rules. Use the Set button to open a dialog for definition of these rules (see below).
- Block pop-up and pop-under windows
Use this option to deny automatic opening of undesirable browser windows (popup is a window opened over an active browser window; pop-under is a window opened under an active browser window).
- Temporarily override by pressing down the ... key
If this option is enabled, holding down a selected key (Ctrl or F12) will temporarily disable pop-up and pop-under windows blocking (i.e. unless a page is loaded).
The Kerio Personal Firewall icon on the Systray indicates when pop-up and pop-under blocking is disabled.
Warning: The F12 key may collide with the Microsoft debugger. If you use the Microsoft Visual Studio, we recommend you to use the Ctrl key.
- Block JavaScript, Block VBScript
Enable these options to filter all commands of the corresponding script run from a website.
Notes: These options might cause problems with displaying of some pages. If so, define special rules for such pages in the Exception Sites tab, or disable the Block pop-up and pop-under windows option and use another method to filter ads (i.e. the Block advertisements option).
These options might cause problems in displaying of some pages or malfunctions — in such cases modify firewall settings as described in the previous item.
Click on the button to open a dialog where ad filtering rules can be edited, removed or added.
Each rule consists of two parts — Server part (name or IP address of a particular Web server) and Local part (relave address of a particular object at the server).
Only one of these items can be specified.
If the WWW Server item is empty, the rule will be applied on the specified relative address at any server.
If the Path on server entry is empty, the rule will be applied on any object at the specified server (this Web server then cannot be accessed
Use matching fields in the Active column to enable/disable individual rules. This way rules can be disabled temporarily (it is not necessary to remove rules and add them later).
Use the , and buttons to edit or remove selected rules or to add a new one. Kerio Personal Firewall includes set of predefined rules (marked with an icon). Predefined rules cannot be edited nor removed, they can only be enabled or disabled.
Kerio Personal Firewall includes database of predefined rules. These rules are marked with a corresponding icon. Predefined rules cannot be modified or removed, they only can be enabled or disabled. The database is updated whenever a new version of Kerio Personal Firewall is installed. Only parameters of the Active column will be kept after an update (rules which have been disabled by the user will not be enabled during an update).
Click on the or the button to define ad filtering rules. Such rules consist of two parts:
WWW server — name of a WWW server
Path on server — path to an object (object localization) placed on the server
Both the wildcard characters or the regular expressions (more complex definitions for experienced users) can be used for this definition.
If the Use regular expressions instead of wildcard characters is disabled, the following wildcard characters can be used for definition of the WWW server and the Path on server entries:
*(asterisk) — represents any number of characters (even an empty string)?(question mark) — represents any single character
Examples:
The WWW server entry is defined by the string
*.kerio.com. Unlike for examplewww.akerio.com, WWW serverswww.kerio.comordownload.kerio.comwill match with this string.The WWW server entry contains the string
www.kerio.f?. WWW serverswww.kerio.frorwww.kerio.fxwill match with this string, WWW serverwww.kerio.comwill not.
If the Use regular expressions instead of wildcard characters is enabled, the WWW server and the Path on server entries must be defined using regular expressions (POSIX standard). Regular expressions can be used to specify any string using special symbols:
A few basic characters are usually sufficient for Web server and Web object definitions:
.(dot) — represents any character in a string.*(asterisk) — represents any number (even zero) of repetition of the previous symbol.Example: The .* expression represents any number of characters.
\(backslash) — is used for specification of a character which is used as a special symbol in the regular expression.Example: The
\.expression represents the “dot” character.
Example (refer to the screenshot):
The Server Part item is defined by the
.*ad\.anything\..*expression.This expression means that server name must include the
ad.anything.string — i.e.ad.anything.net,1ad.anything.com,img.ad.anything.cx, etc.The Local Part is defined by the
.*/img/.*expression.This implies that relative address of the object must include the
/img/string — i.e./img/banner.gif,/data/img/bar.jpgor/img/.
For detailed information on regular expressions go to: