That's what I do with vmware, the most recent vsphere 6.5 can only be controlled via a flash interface (the html5 ui is missing far, far too many features to be

That's what I do with vmware, the most recent vsphere 6.5 can only be controlled via a flash interface (the html5 ui is missing far, far too many features to be used...) so you can make a windows image that's very strongly firewalled (like, say, the only ipv4 dest address for tcp syn packets allowed is the vcenter server...) and that works well. Because it would be hilarious to need to access the system to bring up the system but the image can't run because the system's not up, keep a copy of the image laying around ready for any desktop running vmware workstation. I also keep a vcenter laying around for desktop use which has occasionally come in handy. In the free software world someone would provide a virtualization appliance ready to run, but there are too many copyrights and lawyers involved. There's probably an illegal torrent out there somewhere, I suppose if you really trust your firewall it couldn't be that bad. vmware is the last "serious" "general purpose" thing I'm aware of that requires flash.