ok, just installed vCenter and when I go to add the host I get this error

Cannot contact the specified host (10.1.0.15). The host may not be available on the network, a network configuration problem

Clearly the host is not in state it can be contacted other than via SSH, anyone help at all? There must be something I can do via SSH?

Oh I can add the other ESXi 6.7 host with no issues