Remote access to HA issue

Configuration
1

Hi all.

I have a remote access problem from the Android app on my tablet.
I have configured access via DuckDns and everything works fine, I can connect on remote access via browser (from pc, tablet or smartphone) and via android app (from smartphone, the tablet don’t have SIM for mobile data)

When I’m on a local network, the Android app (if I set internal url as https: //homeassistant.local: xxxx) gives me a certificate error (on smartphone and tablet), like browser, but on the contrary of the browser don’t ask me to continue.
Therefore I use the external url even when I am on a local network.

The problem is that this thing works on the smartphone, but not on the tablet, despite being configured the same way.

This is the configuration for smartphone & tablet

image
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This is the error on tablet
image

Sorry for my bad english.

Can you help me?

2

There are many topic addressing this issue.
Since you use https, https: //homeassistant.local:8123 will be an invalid certificate, as it belongs to duckdns.org
Your need to use the same address both external and internal (with or without :8123, but that depends on which solution your using)
So in order to fix it, you need hairpin NAT, reverse proxy (NGIX) or run your own DNS server…

3

Yes, I know the speech of the invalid certificate on local network, I will also try NGIX.
But my question is another:

Why does it work on smartphone and not as a tablet?

Same HA app version, same wifi, same configuration.

4

I tried to configure NGINX, but the situation remained the same, from the network I continued to access with smartphone and pc but not with the tablet.

I uninstalled and reinstalled the app on the tablet and now it works, with or without NGIX…