Accessing a user's domain via adam

I am using redmine (rails ticket management) and I would like users to be able to log in with their network user and password.

I followed the Microsoft ADAM walkthrough step by step and set up an ADAM instance on my local machine.

http://www.microsoft.com/downloads/details.aspx?familyid=5163B97A-7DF3-4B41-954E-0F7C04893E83&displaylang=en

http://www.microsoft.com/downloads/details.aspx?displaylang=es&FamilyID=9688f8b9-1034-4ef6-a3e5-2a2a57b5c8e4

I have already managed to create a couple of adam accounts, set their password, and I will be able to connect to them from the rails app.

I had to enter the following conf in redmine:

host: localhost
port: 369
account: CN = admin, OU = ADAM users, O = Microsoft, C = US (an adam administrator account I've created)
password: xxx
base DN: O = Microsoft, C = US (taken from the step by step guide)

attribute to map to the name of the login: name

the problem is that I would like to be able to validate the domain users, not the user that I manually add to the adam database ...

So, I can already connect to the ldap server, how can I use it to check for domain accounts?

there is some way to achieve this.

- windows xp SP3

adam sp1

redmine 0.8.3

ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]