First, thank you so much for your patience and interest (and I am learning heaps re docker debugging).
Now, rootless setup:
- using /home/ifb-user/bin/dockerd-rootless.sh as shown above
- and running docker daemon as ‘systemctl --user’ for a user (ifb-user) who is a password-less and sudo-less user
- btw, this was the reason why my previous issue here #14062 has to be solved using a mapping from the rootless container to ifb-user’s name space (and not 2000)
Nginx: I am not good with docker, nginx container etc…
However, I tried the setup ‘wi’hout nginx’ and running nginx as a global service (systemctl nginx), and configuring the nginx backend as localhost:8065
→ without luck, I had the same pb
and still, I am running other publicly facing vms with a setup rootless docker + global ngnix service and all works well
So I don’t know what to say, or do:
Can you deploy a vanilla nginx container out of docker hub f.ex. and successfully access files in it when running on port 443?
I am not sure if I know how to do that… 
in other word: how to make a vanilla nginx docker talk to the other containers…