Works fine:
set load-balancing reverse-proxy backend bk01 server srv01 address '192.168.122.16' set load-balancing reverse-proxy backend bk01 server srv01 port '22' set load-balancing reverse-proxy service ssh backend 'bk01' set load-balancing reverse-proxy service ssh mode 'tcp' set load-balancing reverse-proxy service ssh port '22' set service ssh disable-host-validation set service ssh port '2222'