Port forwarding on Ubuntu Server 12 and Virtual Box [migrated]

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http://serverfault.com – I need advice on how to forward to port 80 and how to make my VirtualBox service accessible to outside world. I can access the web server with my host computer and with putty. I'm following a tutorial on Ars Techica. I think it's relevant that I'm using nginx instead of apache (as suggested in the tutorial). (HowTos)