I've got 3 nodes in a cluster. As far as I'm aware, all three of them have all needed packages installed. I'm not able to look at logs when I'd expect to see anything, and now they're so noisy I have no idea where to look. I can't just reboot this host, it has the PCIE Passthrough devices and provides storage for all the others, but it's given the error condition after each reboot over the last few months. But at the end of the day, in the datacenter SDN tab, it shows vlan available for all three hosts, then it shows my two VLANs as "error". There is a VM that's using one of the VLANs anyway. I can see the interfaces for the VLANs properly configured. Everything in /etc/network/interfaces.d/sdn looks correct and is identical between nodes. The file is included on all nodes. I've clicked "Apply" and this doesn't change. So what can I search for, what can I check, how can I better find info specific to the SDN configuration in the logs?