Page "Filter Definitions" serves for creation, deletion and edition of rules for TrustPort Personal Firewall. The firewall behaviour is influenced by rules. During the attempt for incoming or outgoing connection, the firewall starts to go via all accessible rules in certain set and it starts to look for a rule that can be applied for the given connection. If it finds such a rule, then the connection is either permitted or denied, according the found rule configuration. If it does not find any corresponding rule for the given connection , the default action configured for the firewall is done. It is set by default that the connections that do not satisfy any rules are denied. This functionality can be change on the page Global Firewall Settings in dialog window for advanced configuration. But this turned logic of TrustPort Personal Firewall is not recommended because of security reasons. When the individual rules are evaluated if the certain rule can be applied for the given connection, there is also (where it is specified) carried out the verification of the hash. If the rule is convenient with the given connection and also with the hash of this application, then the rule is applied to this connection. In the opposite case the evaluation of the following rules will go on.
Each rule can be temporary inactivated by marking off. The marking off is done by the check box on the left side next to the rule name. If we disable all the rules, then all the set is also inactivated. The icon by each rule shows the direction (incoming, outgoing or both directions) for which the certain operation is done. The blue colour of the arrow means that the rule enables the communication in the given direction and the grey arrow that the rule denies communication in the given direction. The arrow towards the right means outgoing connection and the arrow towards left the incoming connection. Two arrows mean two-way communication. Information in brackets show some important information about the rule, it means direction of the communication, action and protocol that is active for the given protocol.
Individual rules can be move upwards and downwards in the given set of rules. The rule movement is done by buttons Up and Down or by Shortcut keys . The sequence of individual rules in the set influences the sequence of rules that are checked by TrustPort Personal Firewall during searching for the right rule in case of connection attempt.
To have transparent list of rules it is possible to create sub-group s and to add new predefined rules to this newly created sub-groups. The new sub-groups are created by clicking the right mouse button and there is chosen the menu Create Group . During creation of predefined rules it is enough to mark the group where the new predefined rule should be created. It is not possible to shift rules between groups and create groups inside other group.
Button Add serves for adding of a new rule to the existing rule set. After selection Add is displayed wizzard . Before pressing the button Add it is necessary to choose the set where you want to place the new rule.
Button Edit serves for editing of the existing rule. When the button is pressed, there is displayed a dialog window that serves for editing of the rule features.
Button Remove serves for deletion of existing rule from the set. By pressing Remove is displayed a confirmation dialog window asking if you are sure to remove the specified rule.