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SimpleWall is open-source but Windows-only

> Platform architecture: 32-bit/64-bit/arm64 > Supported OS: 7 SP1, 8, 8.1, 10, 11

while Portmaster https://safing.io/portmaster/ is open-source, offers precompiled packages for Windows 10/11, Debian/Ubuntu and Fedora and is reported to work (sometimes not perfectly) on many kernel/desktop environment combinations, see https://docs.safing.io/portmaster/install/linux .

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Thx for the mention, CTO of Safing here, in case there are any questions.

I can't figure out but does it support showing a popup on every new program trying to connect to Internet and blocks it until I provide permission to connect?

Yes, it does. Here is the setting in the reference: https://docs.safing.io/portmaster/settings#filter/defaultAct...

However, I must add that the prompting system is rather MVP and we are looking for ways to improve it mid-term.

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