A recent experience with a massive DDoS attack led one individual to learn a valuable lesson about server security. Despite setting up key-based authentication, the attacker was still able to consume CPU and IO rates, taking down the site. The solution lay in implementing a cloud firewall through their provider, DigitalOcean, effectively blocking access to the SSH port.

This incident highlights the importance of firewalls in protecting servers from malicious attacks. Two types of firewalls are crucial: cloud firewalls and traditional firewalls. Understanding how to use these tools can help prevent similar issues.

Source: https://dev.to/jimmymcbride/i-survived-a-massive-ddos-attack-and-made-my-server-bulletproof-21gh