External access, duckdns

Hello,

I have installed HA on my windows pc, using the vmware image. I tried to configurate it, so I can also access it from outside my house, using duckdns. I configured the router which is an Asus router AC86U for the port forwarding. I tried to add smartthing integration, generating also the new token. Unfortunately I cannot finalize the procedure.
Please look at the images : Imgur: The magic of the Internet
I think I made the setting in the right way, but something is not working and I cannot understand what.
Anyway, if I try to access to HA using the external link, it does not work with SSL protocol (https). On the contrary using the same address with “only” http, I can access to the login page of HA.
Do you have any suggestions?