Could not start the machine CS50 Appliance 2014_1 because the following physical network interfaces were not found:

VirtualBox Host-Only Ethernet Adapter (adapter 2)

You can either change the machine's network settings or stop the machine.

  • 1
    right click on the appliance in virtualbox > settings > network > adapter 2 > attached to: not attached.
    – kzidane
    Oct 13, 2015 at 4:45

3 Answers 3


Whenever you have a problem with the appliance, simply reinstall it (and WMP). It fixes pretty much everything and there is a reason you have all your files in Dropbox.


To connect to a host-only network you have to create a host-only interface. Select "File" -> "Preferences" -> "Network" -> "Host-only network" -> "(+)Add host-only network."


Make sure that you've followed the instructions.

Link: https://manual.cs50.net/appliance/2014/virtualbox/

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