Tagged: firewall-basics
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A Firewall That Asks You Questions Does Not Work
Approve-or-deny prompts look like the thorough design and reliably produce the opposite. Why prompting firewalls train people to click Allow, and what to build instead.
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Does the Mac Firewall Block Outgoing Connections?
No. The firewall built into macOS blocks only incoming connections, and no setting inside it changes that. Here is what it does cover, and what you need for the other direction.
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What Mac System Traffic Is Normal? A Guide to the Names You Will See
trustd, nsurlsessiond, mDNSResponder and the rest. What each of these programs is, why it connects to the internet, and which ones you must never block.
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Sending or Receiving: Which Direction Should You Block?
Every firewall asks whether to block connections going out, coming in, or both. What the question means in plain terms, and the right answer for common cases.