When a program wants to receive incoming connections, it must create a firewall rule or pop up a dialog and prompt you for permission. You can find its interface under Windows Firewall in the Control Panel. It’s enabled by default and should still enabled unless you’ve disabled it manually or installed a third-party firewall. Third-party firewalls like the one included with Norton may pop up more often, informing you that they’re working and asking for your input, but the Windows firewall is constantly doing its thankless job in the background. The Windows Firewall does the exact same job of blocking incoming connections as a third-party firewall. Why the Windows Firewall is Usually Good Enough Even if a modern version of Windows is vulnerable to such a worm, it will be extremely difficult to infect the computer because the firewall blocks all such incoming traffic. A firewall would have protected against this, even if the underlying Windows software as vulnerable.
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