Rejected URLs from zammad

Infos:

  • Used Zammad version: 5.1.0-1649664858.92d19a62.focal
  • Used Zammad installation type: package
  • Operating system: Ubuntu 20.04.4 LTS
  • Browser + version: Microsoft Edge 100.0.1185.29

While checking our firewall logs I noticed that some URLs are blocked.
Currently, these are mainly the following URLs:

gnu.dc.zammad.com
zt303.dc.zammad.com

What is this being used for and do I need to allow these?
Errors for example during an update do not occur.

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