Product manual

To turn on Smart Firewall from the notification area
4
In the notification area on the taskbar, right-click
the Norton Internet Security icon, and then click
Enable Smart Firewall.
About firewall rules
A firewall is a security system that uses rules to block
or allow connections and data transmission between
your computer and the Internet. Firewall rules control
how the Smart Firewall protects your computer from
malicious programs and unauthorized access. The
firewall automatically checks all traffic that comes in
and out of your computer against these rules.
The Smart Firewall uses two kinds of firewall rules:
Control network access for
programs on your computer.
Program rules
Control all the incoming and the
outgoing network traffic.
General rules
About the order in which firewall rules are processed
The Smart Firewall processes General rules before it
processes Program rules. For example, consider a case
when there is a Program rule that allows Internet
Explorer to access Internet using port 80 with TCP
protocol and a General rule that blocks TCP
communication through port 80 for all applications.
The Internet Explorer application cannot access the
Internet as Norton Internet Security gives precedence
to General rules over the Program rules.
Within the list of General rules, rules are processed in
order of appearance, from top to bottom. Program
Control entries are not processed in order. The rules
within each Program Control entry, however, are
processed in order of appearance, from top to bottom.
Protecting Internet activities
About the Smart Firewall
214