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I want Windows software that blocks everything except one application of your choice. I want this for gaming. Oftentimes when gaming, there's like 5 or more other applications randomly using the internet without my concern, I believe I already disabled every update option on my apps... I noticed this is bad for my ping. I don't want to do this one by one via firewall.

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    Any firewall is specifically designed to do what you want. Simply block everything but the game and you're done.
    – Alejandro
    Dec 13, 2021 at 12:33
  • blocking everything might cost you even more performance (context-switches, file-IO, e.g. just by logging events) than letting the background processes do their work. Besides, "privileged apps" that need network access such as Windows Defender, or backup-demons cannot really be prevented do something on the network.
    – knb
    Dec 14, 2021 at 8:38
  • I don't use Win enough to know - but can't you just set the firewall to reject all outgoing, except xyz? I'm used to Little Snitch on Mac, which can easily do this & save it as a 'profile' so you can quickly switch between them.
    – Tetsujin
    Dec 14, 2021 at 18:12

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Answering my own question, the best software that can do this that I've found (by accident) is NetBalancer. So very easy to set up...

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  • Hmmm... NetBalancer doesn't seem to meet your requirements. It's not gratis. Or do they have a gratis version I'm not quickly seeing on their website? Jan 3 at 8:06
  • I never mentioned "gratis" was the requirement, though it's definitely preferable. Besides, NetBalancer is totally worth it, underrated software that not many people know about it..
    – Dan X
    Jan 7 at 1:12
  • We use the gratis tag to indicate the software must be gratis (free of cost). I'll remove the tag from the question, since it does not apply. I'll also remove the game tag, as we use that tag for actual games. Jan 7 at 10:42
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As fa as I know QubesOS is the only one that can allows you to do so

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  • You can easily do this on Mac using Little Snitch [not free] No idea what equivalent there may be for Windows.
    – Tetsujin
    Dec 14, 2021 at 18:09

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