The Diagnose "Virtual Machine Compatibility" tests your virtual machine configuration for wrong Settings regarding Network Interface, Controller and Hypervisor Modus.
VmWare:
VmWare Appliances should use LSI LOGIC as SCSI storage Controller and no flexible network adapter.
If the Diagnose reports errors for the Controller or Network Adapter, please change the virtual machine settings in the VmWare Host accordingly.
XEN:
Xen Appliances should use Ubuntu 14.04 as template.
If the template Other Install Media was used for Installation, you can migrate the appliance via our Backup / Restore process.
HyperV:
The virtual machine should be created as generation 2 appliance to increase performance.
If the virtual machine was created as generation 1, you can migrate the appliance via our Backup / Restore process.