I did a test like this:
I created a VM with ‘test’ account, assign external IP 1.1.1.1 (example) to the hosting space IPs, then created a VM under that hosting space with that IP.
When solidcp finished the creation (sysprep-ed, IP configured, …) I detached the server from account ‘test’ and try to import it back.
It result with an empty VLAN IP like the image:
So there is no IP to choose (the IP 1.1.1.1 still on that hosting space and haven’t gotten removed) and I can’t enable the External Network.
P/s: Not really relevant to this topic but is it needed to have an Private Network? (for guacamole features, …?) and what does Management Network does?