Docker Pull - connection reset by peer

I use docker on a RockyLinux 8 LXC-Container on Proxmox 7-Host for a while and was able to pull images. For a few months now i am no more able to pull images from docker. The error message i get is:

Error response from daemon: Head "": read tcp> read: connection reset by peer

I am not behind a proxy. The configuration worked fine in the beginning and i can’t figure out what has changed since then. I have another instance of RockyLinux8 with docker on my Win10 using Hyper V. There i can pull images. I then tried to create another LXC with Ubuntu on my Proxmox and tried to run docker on there. I get the same error on ubuntu. So i tried to use an Ubuntu VM instead of LXC on my Proxmox, but still the same error. I guess there is something going wrong on my Proxmox server.

When i curl, this is the response:

{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":[{"Type":"repository","Class":"","Name":"library/hello-world","Action":"pull"}]}]}

docker login is working and i tried it several times to login and logout again. I searched everything i found related to this error, but found no solution.