I found this topic but the suggested solutions won't work for me. Any other ideas?
Maybe it's worth mentioning that I had trouble uploading the appliance as well. I can't remember the error code exactly, but it was something about the "ethernet". And I do only have 3 adapters that I am able to change within the settings.
If you have three adapters, you should have enabled each and selected "cable-connected," with one being NAT, one being host-only, and the third being bridged. You may also need to check your firewall setting on the host or router.