Domain was unassigned
The datacatalog.fz-juelich.de domain was unassigned (i.e. no dns entry anymore).
This may be due to the re-install of the machine via the hdf-cloud, which did reset the dns entry for the zam10059.zam.kfa-juelich.de domain, but i can not verify this.
If this is the actual cause, future deployments should always be done without creating a new hdf-cloud instance.
But regardless of the cause, the domain needs to be properly configured as soon as possible.