login to your server via ssh

don’t forget to update the desired port if you have firewall or ufw enabled

sudo nano /etc/ssh/sshd_config

locate line, usually #Port 22, set the port to what you want

you can remove the # symbol or create new line to insert the new port

Port 12345

save and restart sshd service

sudo systemctl restart sshd

now connect to your server using the new port