VBoxManage modifyvm "next-64bit" --natpf1 "guestssh,tcp,127.0.0.1,8080,,80"
Forwarding host ports < 1024 impossible: On Unix-based hosts (e.g. Linux, Solaris, Mac OS X) it is not possible to bind to ports below 1024 from applications that are not run by root. As a result, if you try to configure such a port forwarding, the VM will refuse to start.
Reference: http://www.virtualbox.org/manual/ch06.html#natforward
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Xuan Ngo is the founder of OpenWritings.net. He currently lives in Montreal, Canada. He loves to write about programming and open source subjects.