Can I use SSH on a port other than the default port 22?

On your server add or edit the following line to your /etc/ssh/sshd_config with the port number:

    Port 22

Whenever SSH to registered hosts they pass the -p flag to specify the non-default port.

Alternatively, update your local step SSH configuration at ~/.step/ssh/config to always use this port for Smallstep-managed hosts.

Match exec "step ssh check-host %h"
  User yourname
  UserKnownHostsFile "/Users/yourname/.step/ssh/known_hosts"
  ProxyCommand step ssh proxycommand --provisioner "sso-ssh" %r %h %p
  Port [non_default_port_number_here]