may be this has been solved by anybody. The samba server is running and I try to test it via smbclient. Here is what I got:
unass@upc20:~> smbclient //upc20/netlogon -Uunass -MASTRO
Enter unass’s password:
Connection to ASTRO failed. Error NT_STATUS_UNSUCCESSFUL
workgroup is, of course, ASTRO and there is no other server around.
Thanks in advance and Merry Christmas to all.