Finding out admin username

From: SvS (sevims@olisys.com)
Date: 10/13/02 

From: "SvS" <sevims@olisys.com>
Date: Sun, 13 Oct 2002 03:50:21 -0400

Guys, I've been maintaining couple of Windows 2000 Advanced Servers and
using terminal services to administer them. Since terminal service is wide
open to internet, I decided to log the bad username/password attempts to
it. One result really scared the hell out of me.. I'm using very unique
administrator username , (I changed the administrator account username ) and
a very unique password to it.
  I was going thru the logs today and noticed that somebody from outer
internet, knew my admin username!!!!.. From the logs I can only see the
usernames and the IP addresses of the user connecting from. I can't see what
password he tried, but he definitely knew my admin username which he MUST
have extracted from somewhere.. There is absolutely no way, I mean NO WAY he
could guess it...
 Now, I'm curios if there is a bug in my server. All the security patches
everything is upto date. But I guess this is not enough, Anybody have an
idea, how might be this happening ?
Thank you in advance,

PS : Servers have netbios ports are opened but no anonymous access is
allowed. Shared to everyone however.

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