Docker pull openhab/openhab:2.3.0-snapshot-amd64-debian fails with unauthorized: authentication required

Dear all,
I tried with and without my DockerID and get the following output:

docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: 
Password: 
Login Succeeded
docker pull openhab/openhab:2.3.0-snapshot-amd64-debian
2.3.0-snapshot-amd64-debian: Pulling from openhab/openhab
e64f847783c0: Downloading [=========================================>         ]  39.32MB/47.67MB
a953981413f0: Download complete 
6c7a2207e3a3: Downloading [=============================================>     ]  57.82MB/63.78MB
f332a91724ee: Download complete 
001b92f4cf68: Downloading 
f40ccbb28546: Waiting 
a42a000e90e9: Waiting 
71ab338f2216: Waiting 
ba935155513c: Waiting 
unauthorized: authentication required

as soon as docker is starting the download of

001b92f4cf68

System Configuration:
Virtual Box VM on Intel i7
Debian GNU/Linux 8 (jessie)
Docker version 17.12.0-ce, build c97c6d6

Thank you for your help!

Regards,
Erik

The issue came up in a country with controlled internet access, this might have been a factor. It is working fine now.