First, have you verified that the credentials you provided for the account are live and working? I use the site server computer account instead so I don't know if the system will allow invalid credentials to be entered or not, or if it validates them automatically.
What I would do is switch over and use the computer account of the site server instead as a test. As long as no one has locked down your domain controller, all user and computer objects have read permissions to all OUs and their objects.
If switching the computer accounts works, this tells you that your service account does not have the needed permissions in Active Directory. You'll probably need "read" permissions to the Domain Controller OU.
Hope this helps!
-Tony
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Edited by
Tony Chirillo
14 hours 44 minutes ago