A trunk uses an Active Directory authentication repository.
You publish the trunk to a server that is running Microsoft Forefront Unified Access Gateway (UAG) 2010.
The Active Directory authentication repository is set to Use local active directory forest authentication.
You try to log on to the trunk.
In this scenario, your logon is unsuccessful.
This issue occurs because Forefront UAG 2010 issues an incorrect DNS query. The incorrect query results in a list of servers. Included in this list are domain controllers that are not global catalog servers. Forefront UAG assumes incorrectly that the list contains only global catalog servers. Because Forefront UAG tries to contact a domain controller that is assumed to be a global catalog server, Forefront UAG cannot complete the authentication process.
To resolve this problem, install the service pack that is described in the following Microsoft Knowledge Base article:
2710791 Description of Service Pack 2 for Forefront Unified Access Gateway 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates