Symantec Norton Personal Firewall 2003, User Manual

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Guarding against intrusion attempts
Customize firewall rules
75
2
To be notified whenever unknown programs access the Internet,
check
Enable Access Control Alerts .
2
To be notified whenever a remote computer attempts to connect
to a port no program is using, check
Alert when unused ports
are accessed .
5
Click OK .
Reset security settings to defaults
Setting a custom security level disables the Security Level slider. The slider
indicates the security level on which your custom level is based, but you
cannot use the slider to make changes to your settings. To use the slider to
choose a preset security level, you must reset the security level.
To reset security settings to defaults
1
Open Norton Personal Firewall.
2
In the Security Center, double-click
Personal Firewall
.
3 Click Default Level .
See “Change the
Security Level
slider”
on page 72.
This resets your security level to medium. Use the Security Level slider to
choose one of the other preset security levels.
Customize firewall rules
Firewall rules control how Norton Personal Firewall protects your
computer from malicious incoming traffic, programs, and
Trojan horses .
The firewall automatically checks all data coming in or out of your
computer against these rules.
How firewall rules are processed
When a computer attempts to connect to your computer, or when your
computer attempts to connect to a computer on the Internet, Norton
Personal Firewall compares the type of
connection with its list of firewall
rules.
Firewall rules are processed in a set order based on their types. System
rules are processed first, followed by program rules, and then Trojan horse
rules.
Once a rule that blocks or permits communications is matched, all
remaining rules are ignored. In other words, additional rules that match