Connect to MQTT Broker via Home Assistant

[rich_kettlewell]

I've set up an MQTT broker on Supla Cloud, but I cannot connect to it via Home Assistant.
I'm trying to do it by following option 1 on https://drive.google.com/file/d/10HTT6j ... jwdMPKQwb3
No matter what credentials/options I try in Home Assistant, I always get "Failed to Connect" with no extra information.

I'm assuming Home Assistant wants the following:

mqtt74.supla.org
8883
[MQTT Broker Username]
[MQTT Broker Password]

Not using any advanced options.

I'm not sure what to try next.
Is there a way to verify the broker with some other test app/cli, to at least know if the problem is on the HA side or the Supla side?

Thanks,
Richard

[pzygmunt]

Try to connect with MQTT explorer first.

[rich_kettlewell]

Thanks, using MQTT Explorer worked.

Then I tried to add the device again and tried setting the advanced option about validating the certificate to "Auto" and it worked!

All sorted - thanks!