The following event may be logged in the Application log:
Event ID: 1054
Source: Userenv
Type: Error
Description:
Windows cannot obtain the domain controller name for your computer network. (The specified domain either does not exist or could not be contacted). Group Policy processing aborted.
The client computer may also experience a very slow logon. Source: Userenv
Type: Error
Description:
Windows cannot obtain the domain controller name for your computer network. (The specified domain either does not exist or could not be contacted). Group Policy processing aborted.