NAC Agent AD SSO delayed 10 minutes to logon

Hi,
I installed NAC in OOB layer 2 with AD SSO and the NAC AD SSO process is very slow (about 10 minutes)
I first logon on Windows with username and password in the domain.
After about of 1-2 minutes, the NAC Agent stays in the system tray and shows to me the certificate message:
I click in yes and after about 5 minutes, the NAC Agent shows to me the certificate message again. I click in yes again then the Nac Agent popup with the message: "Executing automatic login Windows Domain for NAC":
After about 3 minutes the Nac Agent gives me access to network:
I configured rules for Unauthenticated Role to allow:
TCP - 88,135,139,389,445,636,1025,1026,3268,49152-65535
UDP - 88,123,137,389,636
ICMP - Allowed ICMP to Domain Controller
Its about 10 minutes to logon, I tested in Windows XP, Windows Vista and Windows 7 machines.
Thanks
Moises Araujo

Tarik Adman,
I executed the nslookup in the machine that I am testing and in the NAC Server, there are three AD Servers, and they are the same in the machine and in the NAC Server.
I already added the policy to permit the requested ports in the Unauthenticated Role for the three AD Servers:
TCP: 88,135,139,389,445,636,1025,1026,3268,49152-65535
UDP: 88,123,137,389,636
ICMP to the three AD (I can ping the three AD from de cmd testing machine when I am waiting for authenticate)
The NAC Agent is still showing two times the certificate and after about 5minutes he try to logon in the Windows Domain (about 3 minutes to logon)
Thanks
Moises

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NAC Agent AD SSO delayed 10 minutes to logon

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