I put up an experimental version of Mindtouch, opened the router and was able to update it from the internet.... However, later, even though it was still running, I started getting the message, that the wiki was down. Looking at it, it did not seem to be in an abnormal state.
There seemed to be no way to solve the problem. Every time I stopped the player, it restored the VM to its previous unworkable state. I didn't know how to get to the administrative page, because I never got any emails from the wiki.
So much for an appliance. My concept of an appliance is that you plug it in and it works. If you have to fiddle with it, it isn't an appliance...