Docker registry: Can push but not pull

Docker Engine General
1

I have a cluster with nodes and on node1 I’ve running my docker registry with selfsigned certificates (name: registry.domain.com)
I’m able to push images to registry.domain.com

For example

docker tag ubuntu registry.domain.com:5000/ubuntu
docker push registry.domain.com:5000/ubuntu (this works on node1 AND node2)
fc0db02f3072: Pushed 
5c5fb281b01e: Pushed 
latest: digest: sha256:489d765b528bee32479eb22ee4c0841d754d08b898ee5db056253dff8f1e4384 size: 3206

But I’m not able to pull the image

docker pull registry.domain.com:5000/ubuntu:
Trying to pull repository registry.domain.com:5000/ubuntu ...

This keeps trying. I don’t get an error.