Vista - Computer Management: Can't connect to a remote computer

Hi,

I trying to use the Computer Management snap-in to connect to another
computer on my network. Both the local computer and the remote computer are
running Vista Ultimate, and I'm logged on with an administrator-level
account. On the remote machine I've enabled the Remote Administration
firewall exception, started the Remote Registry service, and established an
SMB/named pipes session with net use \\computer\IPC$ /user:username. This
works perfectly if the remote machine is running XP. For the Vista machine,
however, Computer Management connects, but whenever I try to access
something I get an "Access is denied" error.

Is there something else I need to tweak on the remote Vista machine to make
this work?

Thanks.
Paul