Hello Sven,
As per the below error please check if the DNS setting are valid on Skyline Appliance.
Steps:-
- Login to Skyline Console with root.
- Check for Network setting by typing below text.
- /opt/vmware/share/vami/vami_config_net
With the new version, Skyline validate if it's able to reach below URL over port 443.
vcsa.vmware.com
vapp-updates.vmware.com
Please make ensure the endpoints accounts is not expired and password is up to date.