====== fixing users and groups ======
The default install of cygwin may not correctly build your group and passwd files, especially if you are on a domain.  Use these commands to backup your originals, and create proper files from your domain:<code>
cp /etc/passwd /etc/passwd.bak
cp /etc/group /etc/group.bak
mkpasswd -l -d > /etc/passwd
mkgroup  -l -d > /etc/group
</code>

===== External Links =====
  * http://sinewalker.wordpress.com/2006/10/27/cygwin-users-and-groups/