Okey, so if you skip the whole DNS and use http://PUBLICIP:PORT for any of your docker services, does your browser reach them?
You said you have Caddy on bare metal Ubuntu and your services in CasaOS. Sadly I’ve never used that, but is that a VM on your Ubuntu Server and inside that run your docker containers? If so, maybe that’s what’s stopping Caddy from reaching your containers?! Just guessing tbh.
One last thing. I assume you checked if your DNS changes got propagated? I tend to use DNS Checker. And even if the changes are propagated, it can sometimes still not work because of DNS cache in
So assuming that you checked the DNS propagation and it was propagated enough, I’d also
I recently had the problem that the custom secure DNS I use on Firefox took almost a day to update their cache, while every other provider had my changes in a couple of minutes at most.