Windows Security can alert you if the firewall is blocking an app, but there are other signs to look for if it doesn't. You can check if the firewall is blocking an app on the Allowed Apps screen ...

How to manage the built-in firewall on Windows 11 On Windows 11, the Microsoft Defender Firewall comes enabled by default, and you can turn it off or on as needed, allow or block apps, customize ...

Blocking incoming access to your PC Block incoming network access, such as from a specific IP address, is similar to blocking outgoing application access.