Well, sometimes it happens, you are not cautious enough, you are looking at the other side of the window to see what's going on, or, like in my case, you are on the phone while setting up your brand new dedicated server (actually the one where I'm going to move this site!)

I was disabling root access through ssh, and, before restarting the daemon and testing, I created myself a user, assign it to the proper groups, and then, restarted the ssh daemon and tried if I could log in properly.

I forgot one thing: ASSIGNING THE DAMN PASSWORD! and I closed the root session, too late, I can't access my new server. Luckily the hosting service will do something about it.

So, next time, I'll remember: I'm a man, and I can handle only one thing at a time.