[Samba] Samba3 - WinXP - Domain not available

[Dominique]

Hi,

I am sure it has been discussed extensively somewhere, but I cannot find 
a satisfactory solution so far.

We have a samba3 PDC running with Win7 machines (with the right hacks) 
without problems. We have been asked to add an old WinXP machine to the 
network but without success so far.

The setup is as follow:
Server : Samba 3.6.3 on Ubuntu 12.04 LTS
Clients: Win 7 Ultimate (working) & Win XP Pro with SP3 (not working)

We joined the the WinXP machine to the domain without problems. The 
issue arise when trying to logon to the PDC with a network user. The XP 
machine keeps saying it cannot log because the domain is not available.

After googling for a while, we made changes to the XP registry and 
changed policies but to no avail.

Does anyone have the 'right' solution?

Thanks,

Dominique