I was trying to investigate the following error from one of our xp users, after running the netdiag test, i found ou that he was passing everything except:the trust relationship test. (Secure channel for domain was failing)

To combat that I started to use the netdom utility to reset that channel:
netdom reset computer.domain /domain:domainname /Server:dc-name /UserO:Administrator /PasswordO:passwordhere

the problem is first it would just say: access is denied, now it says,
Logon Failure: The target account name is incorrect.

My Domain controller is Windows 2008, client xp. Other clients are running ok.
But because of this error I can't apply group polices, or anything. DNS, IP, all are checked and working fine. I am not running NetBIOS on the domain controller.

If anyone can help me secure this channel with the domain controller it would be great

thanks

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1053
Date: 7/30/2009
Time: 12:35:57 PM
User: NT AUTHORITY\SYSTEM
Computer: gbproberts

Description:
Windows cannot determine the user or computer name. (Access is denied. ). Group Policy processing aborted.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.