Change SSH Port - Ubuntu

[aizu]

vim /etc/ssh/sshd_config

Modify the Port to new port number (i.e: 23)

Port 23

Restart ssh service

/etc/init.d/ssh restart

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If not working, modify file below;

vim /etc/systemd/system/sockets.target.wants/ssh.socket

Modify the "ListenStream" value to target (i.e: 23)

Restart systemctl daemon & ssh service

systemctl daemon-reload
/etc/init.d/ssh restart

Ref: https://askubuntu.com/questions/1483893/unable-to-change-ssh-port-on-ubuntu