samba: 'net view \\server' works, 'net view' fails

From my WinXP client (using cygwin), I can browse the shares on a samba
server whose name I know. But when I try to browse the whole network, I
get a logon failure and the smbd logs show that it's not seeing my
username.

Browsing shares on \\server, from a different machine \\client (using
cygwin) while logged in as testuser:

$ net view '\\server'
Shared resources at \\server

Share name Type Used as Comment
-------------------------------------------------------------------------------
test Disk
The command completed successfully.

But when I try to browse the whole network, I get a logon failure:

$ net view
System error 1326 has occurred.

Logon failure: unknown user name or bad password.

This is an authentication problem. When I issue 'net view \\server' on the
client, the smbd log shows

[2003/11/02 06:55:03, 3] auth/auth.c:check_ntlm_password(216)
check_ntlm_password: Checking password for unmapped user [CLIENT
\[testuser]@[CLIENT] with the new password interface
[2003/11/02 06:55:03, 3] auth/auth.c:check_ntlm_password(219)
check_ntlm_password: mapped user is: [SERVER]\[testuser]@[CLIENT]

But when I issue just 'net view', the smbd log instead shows

[2003/11/02 06:55:32, 3] auth/auth.c:check_ntlm_password(216)
check_ntlm_password: Checking password for unmapped user []\[]@[CLIENT]
with the new password interface
[2003/11/02 06:55:32, 3] auth/auth.c:check_ntlm_password(219)
check_ntlm_password: mapped user is: [SERVER]\[]@[CLIENT]

So for some reason the 'net view \\server' request is processing my user
name, but 'net view' isn't.

Any ideas what could cause this?
Thanks,
Andrew.

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