DirectAdmin can now run on a LAN without any extra steps.
It previously requierd some non-standard steps to get it running, but now it's automatic.
The best way to get help is by creating a ticket.
You can alternatively e-mail questions to support@directadmin.com. We are available Monday through Friday, 9 AM - 5 PM Mountain Standard Time.
You may also visit the forum to see if your question has been answered there.
The old version of this guide is available here.