I can not setup my Synology VH server to work over WAN

I cannot setup my Synology DS220+ VH server to work over WAN
I added to my VH client (windows 10), Modems.WAN.IP:17570
I open my modem's port (Port Forwarding) TCP 17570 to the Synology IP but no result

Am I doing something wrong?
Thanks

#2

Thats all you need to do. It should work if you do that.