Hardening
SSH Hardening: 9 Techniques That Cut 50,000 Monthly Attacks to Almost Zero
Practical SSH hardening guide with nine production-tested techniques to dramatically reduce brute-force attacks and secure your servers
Last January, I sat down to review a server’s auth logs and felt a familiar knot in my stomach.
Over 50,000 failed SSH login attempts — in a single month. Bots methodically hammering port 22 with common credentials, dictionary wordlists, and leaked password databases. Just waiting for one mistake.
That audit changed how I think about SSH security. Not as a checkbox, but as a discipline. What follows are the nine hardening techniques I’ve since applied across dozens of production servers. Not theoretical guidelines — actual configurations with real, measurable outcomes.