Thanks for the info.
I reinstalled my 3 proxmox nodes (X.X.X.120,X.X.X.121,X.X.X,122 / with FQDNs etc.) and before creating any cluster tried to set the proxy and install ceph on each node.
On the first node (X.X.X.120) this worked without issue:
1. I accessed the web interface and set the...