Access to logon denied on server

Hi all,

I configure a new Windows Server 2003 in my enterprise, and it should be the
DC of the network. However, when I try to connect in the domain using a
Win98 workstation, I receive the following message: "The domain password you
supplied is not correct, or access to your logon server has been denied."
In the Event View on server, I receive the following ID:
680 - indicates a successfull logon
576 - special privileges assigned
540 - successfull network logon
538 - user logon (with logon type 3, possible a auto-logoff)
In thats Win98 workstations, I try to install the Win2000 DSClient.exe, but
the effect is the same.

Any help?