If you’re running Windows XP Service Pack 2 (SP2) the new Windows Firewall is turned on by default.
Because a firewall restricts communication between your computer and the Internet, you might need to adjust settings for some programs that prefer an open connection. These adjustments are called “exceptions.”
Windows Firewall now has three settings: On, On with no exceptions, and Off.
On: Windows Firewall is turned on by default, and normally you should leave it that way. When you choose this setting, Windows Firewall blocks all unsolicited requests to connect to your computer, except for requests to programs or services selected on the Exceptions tab.
On with no exceptions: When you select the Don’t allow exceptions check box, Windows Firewall blocks all unsolicited requests to connect to your computer, including requests to programs or services selected on the Exceptions tab. Use this setting when you need maximum protection for your computer, such as when you connect to a public network in a hotel or airport, or when a dangerous virus or worm is spreading over the Internet.
Off: This setting turns Windows Firewall off. When you choose this setting, your computer is much more vulnerable to harm from unknown intruders or viruses from the Internet. This setting should only be used by advanced users for computer administration purposes, or if your computer is protected by another firewall.
To adjust Windows Firewall settings
1. Click Start and then click Control Panel.
2. In the control panel, click Windows Security Center.
3. Click Windows Firewall.
4. In the General Tab make your selection.
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