The SDN section of the "Datacenter" item from the GUI's left-hand list disappeared (it is visible very briefly when the page load, but disappears in a fraction of a second). I cannot create any software-defined zone anymore. When trying to create one using CLI, I get:
root@eridanus:/etc/systemd/network# pvesh create /cluster/sdn/zones --type simple --zone promlan
No 'create' handler defined for '/cluster/sdn/zones'
root@eridanus:/etc/systemd/network#
Nothing else happens and no zone is created.
I suppose something is wrong with the part of Proxmox that manages Software-Defined Networks. Unfortunately, I do not know which part that is (a systemd service maybe?), or which log I can look at for get any clue on what is happening.
What can I look at in my setup so I can get the SDN section visible again, and be able to manage Software-Defined Networks by GUI and shell?
Setup details: Proxmox VE v8.2.4 Debian bookworm Cluster of 3 nodes