[Samba] Weird XP synchronisation issue. Using old cached IP?

[Paul Smith]

First, a little background:
I successfully migrated the samba PDC funtionality from an old Suse
machine to a new debian-based one.  The old machine was named PHOENIX
and had an ip address of 10.10.10.4.  The new one has the same name but
is on 10.10.10.14.
Everything is working just fine with this new domain (authentication,
adding users, computers, printing etc), except for one laptop.
Since the domain changeover I've assigned the old 10.10.10.4 IP address
to a machine running MS Project Server 2003 which works just fine.

Now, the issue:
When the XP-based laptop attempts to synchronise its offline files it
prompts me for a username/password, but the server name in the login
dialog is PROJECTSRV - the name of the ProjectServer at 10.10.10.4.

I have tried to rectify this by bringing down the ProjectServer, adding
an ip eth0.alias to the samba PDC of 10.10.10.4 and synchronising the
laptop.  This worked fine.  However, when I remove this ip alias and
bring the ProjectServer back online, the synchronisation error occurs
again.  I've searched the registry on this laptop for 10.10.10.4 and
PROJECTSRV but have found nothing.

Has this happened to anyone before?  How can I reset the laptop's
synchronisation configuration to only want to synchronise with PHOENIX?

Thanks

Paul