I recently had an issue where a hosting environment was registering a lot of Netlogon Event 1030/1058 issues, being unable to find the Group Policy objects or download them. In this example, the server DC is the domain controller for DOMAIN.LCL.
_Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1030
Date: 10/09/2009
Time: 06:24:29
User: NT AUTHORITY\SYSTEM
Computer: DC
Description:
Windows cannot query for the list of Group Policy objects.