Can not authenticate

From: yoshi (anonymous_at_discussions.microsoft.com)
Date: 04/20/04 

Date: Mon, 19 Apr 2004 17:34:13 -0700

Hi,
I have Windows2000 server SP4 running IAS. This IAS server
belongs to domain-A.Windows2003 domain-B has 2way trust
relationship with domain-A. The IAS server can not
authenticate domain-B users via dial-up whereas the
authentication of users in another windows2000 domain-C
works fine.
The IAS server is registered as a member of 'RAS and IAS
servers' group in domain-B Active Directory. IAS server
has authentication policy that specific group is allowed.
Domain-B users (domain users group) are member of this
allowed group.
What am I doing wrong?
Thanks,