Hardening guides.
Learn how to secure your Debian 13 servers with SSH hardening, UFW firewalls, and cloud provider security groups.
Hardening
Harden SSH on a DigitalOcean Debian 13 (Trixie) VPS
Lock down SSH on DigitalOcean Debian 13 (Trixie): admin user, key-only auth, AllowUsers, ufw, cloud firewall, and fail2ban.
Hardening
Harden SSH on a Hetzner Debian 13 (Trixie) VPS
Lock down SSH on Hetzner Debian 13 (Trixie): admin user, key-only auth, AllowUsers, ufw, cloud firewall, and fail2ban.
Hardening
Set up ufw and the DigitalOcean Cloud Firewall on DigitalOcean Debian 13 (Trixie)
Layered default-deny firewall for DigitalOcean Debian 13 (Trixie): ufw at the host, DigitalOcean Cloud Firewall at the edge, rate-limiting, and the Docker gotcha.
Hardening
Set up ufw and the Hetzner Cloud Firewall on Hetzner Debian 13 (Trixie)
Layered default-deny firewall for Hetzner Debian 13 (Trixie): ufw at the host, Hetzner Cloud Firewall at the edge, rate-limiting, and the Docker gotcha.