On Windows 11, the Windows Security app houses the Microsoft Defender Firewall settings to enable or disable the firewall, allow or block apps, change network profiles, and more, and in this guide ...

What is the Windows firewall, and should you use it? A firewall is a security layer that monitors network requests and controls what requests are allowed or blocked on the device.

If Windows Security is unable to block an app in Windows 11, follow the solutions mentioned in this post to block the app or find out if it's actually malicious.

Windows Firewall is good enough for most users. It blocks outside attacks, and if you're using a security suite, its firewall does everything the built-in one does.