Ftpserver, part 1.

I spent a couple of hours last night trying to get my ftpserver up and running, with the help of PureFTP Manager, a really simple and sweet application. Easy to use, and so forth. Except it's not working. Could be that I was very tired (which I usually am at 3 in the morning), could also be that I'm kind of clumsy when it comes to these things. The problem is this: once installed no logging in to the ftpserver is allowed, not even using Virtual Users. Not even using the real user, or root.
Grateful for tips, tricks and of course, as always, love.