Hi, > would you post a minimal working example? > I made several attempts but no one worked so far. The example you shared should work. Could you try to run: VBoxManage startvm nixops-9a9af89c-6bc6-11e3-9d50-23ed2c71331d-webserver --type headless And provide us with the output? This is the command that nixops runs when starting the VM. Cheers, Rob