I have been trying to create a linked server on a named instance to a default
instance using intergrated security.  It seems to work fine from a default
instance to any other SQL instance, including a named instance, but any time
I create the linked server on the named instance a call to the linked server
fails with the error:

Msg 18452, Level 14, State 1, Line 1
Login failed for user '(null)'. Reason: Not associated with a trusted SQL
Server connection.

All servers are running SQL Server 2000 and the only difference in the
installation besides the fact one is named, is that the named instance is SP4
and all others are SP3.

From a default instance the following works fine:

sp_addlinkedserver 'ORDEV01'
ORDEV01.Master.dbo.sp_helpdb

and the following to a named instance works as well:

sp_addlinkedserver 'LOU\Master'
[LOU\Master].Master.dbo.sp_helpdb

But if I try to created a linked server on the name dinstance LOU\Master I
get the error:

Msg 18452, Level 14, State 1, Line 1
Login failed for user '(null)'. Reason: Not associated with a trusted SQL
Server connection.

Thanks in advance for any help.