Windows Live OneCare Firewall checks programs when they first try to connect to the Internet from your computer. If a program is not listed in the Firewall policy (A list of recognized programs that the Firewall uses to decide which programs have automatic access to the Internet. The Firewall policy is updated periodically as part of the automatic process of updating Windows Live OneCare. ) , Firewall blocks the program by default, and then shows you a dialog box asking if you want to continue to block the program.
The Firewall policy is a list of recognized programs that controls access to the Internet through the Firewall. By default, any program that appears on this list is allowed through the Firewall unless you explicitly choose to manually block the program in your Firewall Program List (The list of programs that are recognized as allowed or blocked by the Firewall. This list is automatically populated by the Firewall policy, but you can also add or remove programs to the Firewall program list in the Firewall Advance Settings.) .
Windows Live OneCare maintains a list of programs in the Firewall policy that are automatically allowed to run when you use the Internet. This list includes all programs that with Microsoft Trusted Root digital certificates (A way of digitally marking a message with the sender's identity, for purposes of verification. A digital signature may be bundled with any message, file, or other digitally encoded information, or transmitted separately.
) . The list also includes some other unsigned programs that are popular with users.
The firewall policy is updated regularly as new programs or program versions are released, and is downloaded as part of the automatic process of updating Windows Live OneCare. The current installed Firewall policy version is displayed on the Windows Live OneCare About dialog box. To open this dialog box, click the Help item on the right side of the Windows Live OneCare display, and then click About Windows Live OneCare....
If you have set the Firewall to block (or allow) a program, and you later change your mind or realize that you made a mistake, you can change the setting in the Program List page of the Firewall Advanced Settings dialog box.
For security reasons, the Firewall treats each new version of a program as a new program. However, the new version of the program might already be covered in your Firewall policy (A list of recognized programs that the Firewall uses to decide which programs have automatic access to the Internet. The Firewall policy is updated periodically as part of the automatic process of updating Windows Live OneCare. ) if it is up to date.