/ip cloud set ddns-enabled=yes

when active, record the DNS Name, ex: snsnsn.sn.mynetname.net

/ip firewall address-list add address=snsnsn.sn.mynetname.net list=wan-ip

add action=dst-nat chain=dstnat dst-address-list=wan-ip dst-port=50000
protocol=tcp to-addresses=192.168.0.10 to-ports=443