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ACS 5 not received AD Groups from Windows 2003 R2

Hi, have anyone testing trust multiple domains with cross forest, and different Windows Server? I need 802.1X authentication using ACS as Radius and Active Directory as External Database, from ACS 5 there is only two options; which are using LDAP or AD. I don’t want to use LDAP because it’s only support EAP-GTC (cannot used windows native supplicant), so I must choose AD profile.

Here is the problem, ACS 5 not received AD groups if the configuration “Windows 2003 <-> Windows 2003 R2 SP2”, but ACS 5 can received AD groups if “Windows 2003 R2 SP2 <-> Windows 2003 R2 SP2” or “Windows 2003 <-> Windows 2003”. I already try google my cases, but nothing I can find.

Please give me advice if you guys know interoperability between “2003 & 2003 R2”.