I have a windows 2003 domain with one server and XP sp2 clients. One machine (which shows as joined to the domain) is having problems. Roaming profiles cannot load and it cannot accessing shares (using a UNC path).. it prompts for credentials & password but then fails to authenticate. Also Mapped network drives do not work. The network connections are fine, DNS points to the domain controller. pinging the domain controller by name works. It seems to be an authentication problem. Other machines and roaming profiles all work fine.
Any help would be greatly appreciated