Domoticz

I am using the beta version of Dashticz but encounter some strange behaviour with the domoticz_ip reference.
I have domoticz on a raspberry 3+ and dashticz on my normal webserver both on the same lan.
While on my own network, it works perfectly if I state the reference by IP-address like http://192.168.1.15:8080 or by domain like http://www.mydomain.nl:82 ( i have a forwarding rule to point http://www.mydomain.nl:82 to http://192.168.1.15:8080).
If I am outside my network, going to http://www.mydomain.nl:82, i end up on my Domoticz screen. So perfect as expected.
However if I go to http://www.mydomian.nl/dashticz, I get the message that my domoticz config is not correct.
This I can understand if I amusing the IP-address but would not expect this when using the domain name.
Any tips how to overcome this problem?

Could there be a caching issue? After trying various combinations, no connection at all. The IP address definitely is ok. Any tips?

I found the issue although have not resolved it yet. It is about "Mixed Content". If I run everything on ip-address over http, it works nicely. My domain goes automatically over https. So probably have to work with the network config on my domoticz system

Ended up excluding the Dashticz site from https via "rewrite" for Apache. Now working as expected
Alternative could be to setup Domoticz over https

How do you securely reach your dashticz outside your network?

So far no success on that one. On the other hand, not really important to me. Remote, i stay with Domoticz itself.