Guides about ssh port
- SSH hardening: lock down OpenSSH on Ubuntu and Debian With keys in place, a few more SSH settings shrink the attack surface further. Apply them in one drop-in file and verify each change before you log out. Intermediate 20 min
- Locked out after a firewall change: how to get back in A firewall rule or a port change can cut your own connection. Use the console to undo it, then apply firewall changes with a safety net. Intermediate 10 min