Host error - On MQTT Installation

I’m trying to setup MQTT into Home Assistant but on me doing so, I’m getting Host Error, I’m really starting to think it be easie to use Nabu Casa instead but will see first if there is a fix for this error or a reason why?

Thanks

It won’t start and gives this error message!

and keeps asking me to connect!

I’m getting a Bad Gateway error code 502 trying to connect from MQTT in Home Assitant to Cloudflare and I need this running to install Blinds and need a fix please, I have tried to re do it many times now and also tried different method to not need to be using Cloudflare, but Im faces with eror after error after error