I am facing a strange network issue with home assistant.
Firstly, I have setup the Home Assistant with a few sensors with raspberry pi 3 with the InfluxDB and Graphana interfaces.
This is working perfectly fine.
Secondly, I setup duckdns and gave access to all these 3 UIs (Home Assistant, InfluxDb and Graphana) over the internet.
I have separate 2 WLAN connections in my house and I am able to access all 3 webages using both the WLAN connections with duckdns as well as by directly typing the IP address.
Now comes the strange part.
If I go out of the house and try to use my phone or tablet to access my duckdns site using cellular data connection, the page does not load.
If I am able to connect to the webpages using 2 separate WLAN connections (RaspberryPi on WLAN1, Laptop to read on WLAN2) then it means that I am able to access it over internet.
But this fails over cellular data.!!!
What could be causing this?