Read Access to Active directory failed

Hi all,
When setting up a new active directory sources, the system is generating the following error,

Grant Read permission on the domain controller for this user.
Read access to Active Directory failed. LDMS requires read access for user management functionality.
The problem came up when trying to set up a new user with administrator rights on LANDesk but after adding them to my LAN desk administrator group, the user is not still able to log in to LAN Desk.
The account that I am using does have read rights; this is a new installation of LDMS 9.0 with SP2 and not an upgrade. Uninstalling and re installing the LDMS has not proved of any use.
I need help on how to solve these problems as soon as possible. Any help will be greatly appreciated.
Thank you.
