Strange XP to Vista Authentication Problem

Hello,

My problem is on a peer-to-peer network involving XP Pro and Vista Business.

Identical user accounts are on all machines. I've applied the KB922120
patch to XP. The Vista machine has sharing enabled, password required. I
can access the Vista Machine via Remote Desktop from the XP machine.

I want to share some folders on the Vista machine with the XP machine and
only with specific users. I right-click a folder ("Test") that I want to
share and select the Sharing tab. The Share button is disabled, so I use
the Advanced Sharing button and add the Administrators group, giving it full
control. I log on to the XP machine as an administrator that exists on the
Vista machine.

The Vista machine can see and access shares on the XP machine. The XP
machine can /see/ all shares on the Vista machine, but can only /access/ the
Public folders. I get an Access Denied error when I try to open the "Test"
folder.

However, if I add the Everyone group to the "Test" shared folder on Vista,
then I can access the folder from XP.

Why is this and how can I share only with the correct specific users rather
than with Everyone?

David Dickinson
eveningstar at die-spammer-die dash mvps dot org