Error on AD synchronization step when installing SEE 7.0

Hi all,

I have purchased the Symantec Endpoint Encryption 7.0. I have installed successfully on my test lab (with VMWare Workstation). But when i implemented on my real system, i got an error on AD synchonization step:

My AD information:
Windows server 2003 Ent
1 domain with 3 sub-domain
I synchonized with domain admin account
No firewall on the path from SEE Server to AD

I intalled SEE on the other server but the same error occur.

Thanks & Best regards.