It's a good idea to leave this checked, as a security measure. For example, you may have a virus, spyware or other malicious program try to load itself on your computer. This way, you can keep the program from loading. It's a good idea to block any program you have not just loaded from a disc or downloaded from the Internet. In other words, if you didn't initiate the installation of the program in question yourself, block it, because it's likely to be dangerous.
The "Block all incoming connections I'd only check this is your computer support person asks you to for some reason. The final item in the main Windows Firewall menu you need to know is the "Restore defaults" link on the left. It brings up the screen here, which turns the firewall back on with the default settings. If you've made changes to your firewall over time and don't like the way it's working, this puts everything right again. The Windows Firewall is a powerful security tool and one you should use at all times.
If connected to the Internet, your computer could be compromised in minutes, or even less, if the firewall is disabled or otherwise turned off. If you get a warning that it's off, take immediate action -- and I do mean immediate -- to get it working again.
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In general, you must explicitly allow traffic to pass across a firewall, though there will be some occasions when you need to configure a deny rule.
You will learn about deny rules later in this lesson. Windows Firewall and WFAS ship a minimum number of default rules that allow you to interact with networks. This means that although you are able to browse the Web without having to configure a firewall rule, if you try to use an application to interact with the network that is not covered by a default rule, such as File Transfer Protocol FTP , you receive a warning.
This behavior is different to earlier versions of Microsoft Windows, such as Windows XP, where the firewall blocked only incoming traffic and did not block outgoing traffic.
The firewall in Windows 7 blocks most outbound traffic by default. When a program is blocked for the first time, you are notified by the firewall, allowing you to configure an exception that allows traffic of this type in the future.
The Windows 7 firewall uses a feature known as full stealth. Stealth blocks external hosts from performing Operating System OS fingerprinting. OS fingerprinting is a technique where an attacker determines what operating system a host is running by sending special traffic to the host's external network interface. After an attacker knows what operating system a host is using, they can target OS-specific exploits at the host. You cannot disable the stealth feature of Windows 7.
Boot time filtering, another feature of Windows 7, ensures that Windows Firewall is working from the instant the network interfaces become active.
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