this post was submitted on 06 Aug 2024
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I'd just install UFW and either set the default for incoming and outgoing to deny and unblock the game ports manually, or just set incoming to deny and outgoing to allow.
You could pair that with OpenSnitch to see all attempted incoming and outgoing connections and block them by default, and then just allow the ones you want as they happen.
Thank you for these suggestions! I've been looking for something like Opensnitch for a long time.