<!--'''IMPORTANT: we're transitioning to not having OpenVPN built in, but rather as an app, the [http://www.amahi.org/apps/openvpn OpenVPN one-click app]'''--> Going forward, you will need to install the Amahi [http://www.amahi.org/apps/openvpn OpenVPN one-click app]application.
'''You need to forward one port (1194/UDP) to your HDA's IP''' to enable your OpenVPN service from outside.
