Security Basics: A Firewall and a Few Habits

Closing everything that should be closed, opening only what is needed, and not locking yourself out in the process

Closing everything that should be closed, opening only what is needed, and not locking yourself out in the process. A free lesson from the Linux Admin…

What it covers

• Something Is Knocking on Port 22
• Layers of Protection
• Worked Example: Lock the Door, Keep the Key
• Notes, and a Security Baseline

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