Adding PrivateNetwork=yes
to your systemd units is a game changer for services that don't need network access - it completly isolates the service from the network and prevents any outbound connections.
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Good callout! You're absolutely right, and here I was primarily focused on publicly accessible services. Thanks for the addition.
I definitely learnt (more than) a few things from your write up, thank you sir!
Very glad to gear it! Learning new stuff with Linux is the fun part of the journey.