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I emailed the dev and they responded by pointing me to this post and explaining that this was because of a design decision by Apple and not something they are a

I emailed the dev and they responded by pointing me to this post and explaining that this was because of a design decision by Apple and not something they are able to fix. https://www.obdev.at/blog/three-way-handshake-bypassing-little-snitch/ https://www.obdev.at/blog/three-way-handshake-bypassing-litt... Perhaps just VPN + little snitch is your best bet if you're still worried

frankjr 2y ago
The blog post is mentioned in the first linked article. Needless to say I fundamentally disagree with Apple's decision* - If I explicitly install a firewall, I want it to actually function like a firewall and not let some packets through. The overhead explanation seems a bit like a stretch. * It's actually not clear whether this is a feature or a bug. Apple never responded to the bug report (FB12088655).
- MindfulMonk 2y ago
  Yeah it seems going to https://feedbackassistant.apple.com/feedback/12088655 https://feedbackassistant.apple.com/feedback/12088655 the report doesn't even exist anymore. Would be good to get an official answer from Apple if this is won't fix or coming as a fix in a future release.
  - lapcat 2y ago
    > Yeah it seems going to https://feedbackassistant.apple.com/feedback/12088655 https://feedbackassistant.apple.com/feedback/12088655 the report doesn't even exist anymore. That link is for Apple engineers. Feedback reports are not public. They're only accessible by the reporter and Apple.