How to Change the SSH Port (Step-by-Step Security) →
Port 22 is constantly attacked by bots. How to change the SSH port safely, how not to lock yourself out, and extra hardening steps.
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DDoS and security
What Is a DDoS Attack? Layers and How to Defend →
The difference between Layer 3, 4 and 7 attacks, how to tell your server is under attack, and which protection stops which attack.