Ubuntu 9.10 Networking

I just ran into a goofy problem. Every time I rebooted, I would not be able to connect to my ssh server. I finally got fed up with having to switch keyboard and mouse cables (lacking a KVM), and so I decided suddenly to tackle the problem.

Switching to TTY/1, I learned after logging in that my machine had no IPv4 address. What the hell?!? The shocking thing about this, other than its existence, was that it wasn't a firewall issue.

I logged into Gnome, checked the networking settings, and obscured somewhere on the bottom of the IPv4 settings was a little check box; it said "Enable for all users." So, apparently you can limit specific network connections to specific users. If you don't already know about it, though, it can be a pain in the ass.