Hello @jenschude
I have tried this setup on the Cloudron demo server.
Installing the https://my.demo.cloudron.io/#/appstore/com.docker.registry?version=2.0.0 app with allow all users from Cloudron as the option.
Using the location dr.demo.cloudron.io after the installation has finished going into System=>Docker settings and adding the registry with user cloudron and password cloudron:
[image: 1763483543092-745eb4ae-58a7-4e7d-bee8-1463088b7686-image.png]
No issue here:
[image: 1763483556489-83bfb60c-5e68-424b-bb7a-3241fa41ecd8-image.png]
This is also the type of setup I am using daily for pushing test images with the docker remote builder app for app development.