How to install 10.7 Lion on an a headless mini

osx lion

I used to be able to install 10.6 Server remotely via ARD (blank username, first 8 characters of the serial number as password), but the functionality seem to have been removed by Apple on 10.7 (client version, the only once that can be downloaded and burned/imaged to a dvd/usb). The installer gets an IP but a quick port scan doesn't show any open ports; any advice?

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