samba - Oct 2011 - Error 0x000006d1 when connecting to printer from Windows 7

Good morning,

we are having a problem connecting to samba printers from Windows 7 clients.
When trying to connect, it fails with the following error: "Windows cannot
connect to the printer" and "Operation failed with error
0x000006d1".

Samba version 3.5.4 on CentOS 5.6
Windows 7 32-bit SP1
Printers HP Laserjet 9000, Colour Laserjet 9500, laserjet 4000
Drivers: tried with Universal print driver (the only available from HP) PS, PCL
5 and PCL 6

Interestingly enough, the drivers are copied to the client and I can see them in
the print management.

Windows XP, 2003 and 2008 clients have no problem whatsoever connecting and
printing.

I tried, for the sake of troubleshooting, to connect using a local printer and
specifying \\server\printer as port. It worked for the 4000 printer, but just
hangs for the 9500 when finalizing installation.

There was a similar issue reported on 2008, but changing the group policy of
"always render on server" did not help on Windows 7

Any help would be appreciated.

Thanks,
Ricardo