Having issues Intergating with Active Directory/Adding Admin user

when I get to the admin acocunt page it says it can’t find the account.

also When I click the “test settings” button it just reloads the page, is it suppose to show a checkmark or something?

here are my settings:

Connection Settings

Server Type: Active Directory

Host: SERVER.DOMAIN.ORG

Base DN: DC=Domain, DC=ORG

Administrator DN: Administrator@domain.org

Pass: Domain Admin Pass

User Mapping:

UserName Field: sAMAccountName

User Filter: (&(objectClass=organizationalPerson)(memberOf=cn=IMUsers, ou=Groups, ou=MFRL, dc=Domain, dc=org)

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Any Ideas What I’m doing wrong? I’m not getting any errors until I get to the add admin page. which is “No username was provided or the specified username was not found”

Also this is currently a windows 2000 domain (will be upgraded to 2012 eventually)

I was using the User Filter when I should have been using the group filter.