I can connect trough following methods:
However, using h__ps:((<sub.domainname.ext>:12345 is not working, while - off course - the domainname is correctly translated into the external ip (in fact I ping the domainname to retrieve the current extrnal ip that I can use to connect)
Local access: HTTP & HTTPS
Remove access: HTTPS
PS: The __ and (( instead of tt and // are because links are not allowed.