IPs blacklisted from gitlab for software updates


it seems that our IP block is blacklisted from gitlab for software updates.
We run our own installation on a debian server and just check once a day for package updates. At the moment we can’t make any connections to update the software.

apt-get update

fails when checkin for new software.

curl -v https://packages.gitlab.com/gitlab/gitlab-ce/debian/dists/stretch/InRelease

times out.

Connection and update is working if using a proxy server.

Does anyone know who to contact or get information why?

Thanks for any help.