Not enough server storage is available to process this command

I have an Active Directory domain in 2000 native mode. I run all
managment tasks from a DC with Server 2003 Standard Edition. From
Active Directory Users and Computers I attempt to manage a few random
clients each day to verify the secure channel.

When I try to manage a client there are two possibilities (1) The
computer management snap-in will appear immediately if the secure
channel is okay, or (2) The machine is turned-off, disconnected from
the network, or remote connections disabled - resulting in a long delay
and an error dialog, followed by an empty msc window.

Today I have a third possiblity, (3) an error dialog immediately
appears:

Computer \\computername cannot be managed. Not enough server storage
is available to process this command. Choose connect to another
computer from the action menu to manage a different computer.

After researching this message, I find that it is only documented for
Windows NT:
http://support.microsoft.com/kb/q126401/
http://support.microsoft.com/kb/225782/EN-US/

Two of my XP clients are displaying this message. I'm not too worried
about the XP clients, because I can re-image the boxes.

In the long run I just want to know why I'm getting NT error messages
from administering XP on 2003. Are NT messages still fair game? For
Active Directory? For WMI?