I'm trying to test manageing users with MMC, and I have the Admin tools
for 2003 installed on an XP workstation (that has successfully joined the
domain). After logging in to the workstation using the domain admin
(administrator@domain.com), I get an authentication error when trying to
connect to the domain in MMC.

For example, If I select the manage AD users and groups link, it tells me
I have an ID or password error.