[Samba] User e-rizzo in passdb, but getpwnam() fails

[Giuseppe Sacco]

[Please CC to me since I am not subscribed to the list]

Hi all,
I have a new samba installation, Debian + samba 3.0.8 configured as PDC.
I added the first machine to the domain and now, after reboot, I cannot
log in.
The error I see, in samba log, is:

  User e-rizzo in passdb, but getpwnam() fails!

but this is rathere strange since e-rizzo is present in passwd:

# getent passwd e-rizzo
e-rizzo:x:1008:501:description:/samba/e-rizzo:/bin/bash
#

and it is present in samba database:

# pdbedit -d 0 -u e-rizzo
e-rizzo:1008:description
#

Do you have any hints on what to check or what the problem is?

Thanks,
Giuseppe