0:00 what is secure shell protocol 1:15 openssh and how to use the ssh command 2:37 ssh keys 5:20 what are ports? 6:57 scp and file copying 7:17 run a local ssh server (ssh daemon setup) 8:24 opening your ssh server to the WAN 9:44 /etc/ssh/sshd_config 10:29 port forwarding 11:49 firewalls After changing sshd configuration, restart sshd via systemctl. ( ) After changing ufw settings, reload ufw. ( ) *To allow only one ssh keyholder* ensure you have the user's public key at /home/username/.ssh/authorized_keys (with correct perms and owned by the user), then: PasswordAuthentication no PermitRootLogin no ChallengeResponseAuthentication no UsePAM no AllowUsers username *To allow only one IP in through ufw:* sudo ufw allow from to any port 22 sudo ufw deny 22 ssh keys: *More info about port forwarding, and security:* #Port_forwarding The site the archwiki suggests to learn more about port forwarding: #protection Painting is by Ivan Shishkin (1889) - "Morning in a Pine Forest".