Focus on: The firewall

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One of the most trusted security elements, it can nonetheless be misconfigured and play right into the hands of the hacker.

1. PUBLIC INTERFACE Your firewall should be invisible from the public internet. For example, a TCP SYN packet should simply be dropped. Don't reply with a reset, or the attacker will know that there's something on the end of the IP address. If the hacker can't see your firewall, then ...

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