I started recieving the below error about 300 times a day in my event log right after upgrading from WSS 2.0 to 3.0. WSS 3.0 administration and sites work fine. I checked the services for WSS and none are running as NT AUTHORITY\SYSTEM. No other changes have been made and dcdiag comes back with all passed. Once again everything worked fine until the wss 3.0 upgrade. SharePoint Central Administration v3 app pool is running as Network Service, and the only sharepoint site is running as IWAM_SERVERNAME.
No noticable issues except for the event log being filled up with this error.
Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1053
Time: 8:21:49 AM
User: NT AUTHORITY\SYSTEM
Windows cannot determine the user or computer name. (The format of the specified domain name is invalid. ). Group Policy processing aborted.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp