No GC Logon uses the information in the replication schedule to determine when it should attempt to refresh the cache. Currently, there is no replication schedule defined for the preferred site; therefore, the cache routines cannot schedule an update.
The group membership cache task was unable to obtain a connection schedule to the following preferred site.
Preferred site: %1
Use Active Directory Sites and Services to check the site connectivity settings.
For more information, see:
Microsoft Help and Support for Microsoft Windows Server 2003
Microsoft Knowledge Base