Ah, forwarding is indeed disabled by default
Change to true, restart the addon an it should work.
you don’t give up 
thanks! this got me further and now I keep suspecting its the certificate…
I see in the log of the SSH its trying to connect (connect_to 192.168.1.52 port 8443: failed), but on the page now I get “Can’t connect securely to this page” in IE and in Chrome ERR_CONNECTION_RESET
As stated in an earlier post, when at home on the same LAN I always get the warning that the site is not secure as the certificate is issued for xxxx.duckdns.org and not xxxx.local (at least that is what I think is the reason).