Established VPN - User has wrong set of credentials

I have a corporate network which has a Win 2k AD and VPN setup.

I have an off-site machine that was joined to the domain. A user logs onto that local machine with their own username/ password. They then establish the VPN connection. When they go to use resources on the network, it tells them bad username/password, and they then have to supply new credentials. I have them use domain\username, and their password, so that they get the domain credentials. For the rest of the logon, it works fine.

How can I configure it so that the remote user gets the right domain credentials when they connect to the VPN? I think as it stands now, when it tries to access a remote resource, it sends the local machine's user/password, and not the domain one.
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At the initial logon screen, have them check the block "logon using dialup connection", and choose the domain in the drop down box.
This should launch the VPN dialer to establish the connection first, then they get authenticated on the domain.


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