Well, I personally would say that the most of us don't even know how to secure a server properly, including me.
Long time ago, I hosted the famoust PServer out there, called DarknessFight. We got hacked a few times, and I was able to close alot of those security holes. But still, it wasn't perfect, because I didn't have the experience about what people are going to do with such "little" projects or are able to do. Also Windows itself has security holes, so well..
Basically most of us just have some kind of superficial knowledge (hope this is the right word for it), so it's kinda useless to do a part 2 here.
I'm going to write a topic about what I've learned about security when DF was up, let's see if this helps out a bit. ;p Let's move there with that discussion then, since this is kinda Offtopic. ;p