Why rate-limiting self-hosted services is essential against brute-force and credential attacks

A self-hoster explains how exposed services such as Jellyfin and Vaultwarden are vulnerable to credential stuffing, brute-force logins, API scraping, and resource exhaustion. The author recommends fail2ban, which watches logs and bans offending IPs at the firewall, with example jail configurations for SSH, Nginx, and specific apps. Nginx rate limiting via limit_req is also suggested as a second layer of defense. Cloudflare's free tier is presented as an optional front-end offering DDoS protection and challenge rules, with a caveat about it becoming a single point of failure. The piece notes that rate limiting does not protect against unpatched zero-day exploits or weak passwords that pass brute-force checks.