You need to deactivate the UGMC option on some of your domain controllers.
At which level in Active Directory would you deactivate UGMC?
A. Server
B. Site
C. Domain
D. Forest
Explanation/Reference:
Basically the same as B/Q22:
http://www.ntweekly.com/?p=788
Question:How To Enable Or Disable Universal Group Membership Caching Windows Server 2008
To enable or disable Universal Group Membership Caching follow the steps below:
Open Active Directory Sites And Service -> Go to the site you need to enable or disable the feature -> Right click on the NTDS Site Settings and Click on Properties
Tick the Box next to Enable Universal Group Membership Caching to Enable or Disable.
http://gallery.technet.microsoft.com/scriptcenter/c1bd08d2-1440-40f8-95be-ad2050674d91
Script to Disable Universal Group Membership Caching in all Sites
How to Disable Universal Group Membership Caching in all Sites using a Script
Starting with Windows Server 2003, a new feature called Universal Group Membership Caching (UGMC) caches a user’s membership in Universal Groups on domain controllers authenticating the user. This feature allows a domain controller to have knowledge of Universal Groups a user is member of rather than contacting a Global Catalog.
Unlike Global group memberships, which are stored in each domain, Universal Group memberships are only stored in a Global Catalog. For example, when a user who belongs to a Universal Group logs on to a domain that is set to the Windows 2000 native domain functional level or higher, the Global Catalog provides Universal Group membership information for the user’s account at the time the user logs on to the domain to the authenticating domain controller.
UGMC is generally a good idea for multiple domain forests when:
1. Universal Group membership does not change frequently.
2. Low WAN bandwidth between Domain Controllers in different sites.
It is also recommended to disable UGMC if all Domain Controllers in a forest are Global Catalogs.
