ACS and Windows Domain / AD

Hi All,
In my environment there are two Windows Domain - Doamin A and B. ACS is configured on member server in domain B and hence Windows Authentication for users in Domain B is working fine. However I'm unable to see domain A in Configure Domain List on ACS server in Windows Domain configuration menu.
Please note, there is one way trust between domain A and B with Domain A trusting Domain B.
Is there a way I can use the same instance of ACS to authenticate the users in Domain A as well? If YES, can you please guide me with some pointers - thanks.
I'm using ACS and Windows AD elements to authenticate users for SSL Web VPN on ASA 5540.
Apprecaite quick help on this.
-Satishcp

Unfortunatley we are not using the Cisco Secure ACS Appliances, rather its ACS Ver 3.3 running on Windows 2000 Server (member server in Domain B).
My guess Remote Agents for Windows / Solaris works with Appliances alone.

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Hi Prem,
Thanks for these inputs.
I've passed the logs details to full, performed other tests and retrieved the package.cab.
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I copy below an extract of the auth.log.
I also attach parts of auth.log and RDS.log.
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Best Regards,
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AUTH 04/07/2007 12:25:41 S 5100 16860 Listening for new TCP connection ------------
AUTH 04/07/2007 12:25:41 I 0143 16704 [PDE]: PolicyMgr::CreateContext: new context id=1
AUTH 04/07/2007 12:25:41 I 0143 16704 [PDE]: PdeAttributeSet::addAttribute: User-Name=host/nomadev2001.lab.fr
AUTH 04/07/2007 12:25:41 I 0143 16704 [PDE]: PolicyMgr::SelectService: context id=1; no profile was matched - using default (0)
AUTH 04/07/2007 12:25:41 I 0143 1880 [PDE]: PolicyMgr::Process: request type=5; context id=1; applied default profiles (0) - do nothing
AUTH 04/07/2007 12:25:41 I 5388 1880 Attempting authentication for Unknown User 'host/nomadev2001.lab.fr'
AUTH 04/07/2007 12:25:41 I 1645 1880 pvAuthenticateUser: authenticate 'host/nomadev2001.lab.fr' against CSDB
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http://www.cisco.com/en/US/partner/docs/net_mgmt/cisco_secure_access_control_server_for_windows/4.2/user/guide/UsrDb.html#wp353805
http://www.cisco.com/en/US/partner/docs/net_mgmt/cisco_secure_access_control_server_for_windows/4.2/installation/guide/windows/postin.html#wp1041202
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