Windows error 1332: No mapping between account names and security IDs was done

I'm trying to configure WinSSHD on a Windows 2003 SE server (VM, externally hosted by an ISP). I thought I had configured everything correctly. I have a similar setup working on a local server. When I try to login I get the following error in the event log:

Event Type:      Warning
Event Source:      WinSSHD
Event Category:      None
Event ID:      4097
Date:            23-7-2007
Time:            14:21:33
User:            N/A
Computer:      serverxxx
[029] WinSSHD 4.23: Session thread 13060 handling connection from xx.xx.xx.xx:2326:
Logon attempt 1 for user name 'userx' with logon method 'password' failed: The supplied user name could not be looked up: User name matched to virtual account 'userx', but looking up the underlying Windows account '' failed: (Cached) First LookupAccountName() for 'serverxxx\yyyadmin' failed with the following error: Windows error 1332: No mapping between account names and security IDs was done.

I found an article at the MS site (, but that refers to startup. I'm not sure if I can do this safely. I found PowerUsers to be present in several local security policies. (Local Security Settings > Local policies > User rights assessment > ... (e.g. access this computer from the network). But I'm not sure whether I can remove those powerusers safely. (Which I won't do anyway without consulting the ISP, and I'm not sure that I even have the rights to do this.)
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There's a discussion saying something about domain order
R7AFAuthor Commented:
Thanks! I didn't think domain order would be necessary to specify, but even in the case of just one domain it is.
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