[Samba] security = SHARE

[José Puente]

Hello,
Please, i need help with security mode = share.
i want to configure security = share and the parameter "username = user" 
in a shared folder to avoid that everybody could access to it. f I have 
understood correctly the manual, this configuration enables to access if 
the password provided matches with the user`password. But when i try to 
access returns this error:
         smbclient //SERVER/Docs
         Enter user's password:
         Domain=[WORKGROUP] OS=[Unix] Server=[Samba 3.4.7]
         Server not using user level security and no password supplied.
         tree connect failed: NT_STATUS_WRONG_PASSWORD

I also tried:
         smbclient -U user%passwd //SERVER/Docs
         Domain=[WORKGROUP] OS=[Unix] Server=[Samba 3.4.7]
         Server not using user level security and no password supplied.
         tree connect failed: NT_STATUS_WRONG_PASSWORD

         smbclient -U user%passwd //SERVER/Docs -P
         Failed to open /var/lib/samba/secrets.tdb
         ERROR: Unable to open secrets database

         sudo smbclient -U user%passwd //SERVER/Docs -P
         ERROR: Unable to fetch machine password for SERVER$@ in domain 
WORKGROUP

If i change "passdb backend = smbpasswd" in GLOBAL options:

         smbclient -U user%passwd //SERVER/Docs -P -e -A 
/etc/samba/smbpasswd
         ERROR: Unable to open credentials file!

         sudo smbclient -U user%passwd //SERVER/Docs -P -e -A 
/etc/samba/smbpasswd
         ERROR: Unable to fetch machine password for SERVER$@ in domain 
WORKGROUP

My system:
Linux user-laptop 2.6.32-23-generic #37-Ubuntu SMP x86_64 GNU/Linux

My config:

testparm

Domain=[WORKGROUP] OS=[Unix] Server=[Samba 3.4.7]
smb: \> quit
user at user-laptop:~$ testparm
Load smb config files from /etc/samba/smb.conf
rlimit_max: rlimit_max (1024) below minimum Windows limit (16384)
Processing section "[printers]"
Processing section "[print$]"
Processing section "[Docs]"
Processing section "[printers]"
Loaded services file OK.
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions

[global]
         netbios name = SERVER
         server string = %h server (Samba, Ubuntu)
         map to guest = Bad User
         client lanman auth = Yes
         security = SHARE
         obey pam restrictions = Yes
         pam password change = Yes
         passwd program = /usr/bin/passwd %u
         passwd chat = *Enter\snew\s*\spassword:* %n\n 
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
         unix password sync = Yes
         syslog = 0
         log file = /var/log/samba/log.%m
         max log size = 1000
         dns proxy = No
         usershare allow guests = Yes
         panic action = /usr/share/samba/panic-action %d

[printers]
         comment = All Printers
         path = /var/spool/samba
         create mask = 0700
         printable = Yes
         browseable = No
         browsable = No

[print$]
         comment = Printer Drivers
         path = /var/lib/samba/printers

[Docs]
         comment = Documents
         path = /home/user/Documentos/Docs
         read only = No
         username = user

smbtree

WORKGROUP
         \\SERVER         server (Samba, Ubuntu)
                 \\SERVER\IPC$           IPC Service (server (Samba, 
Ubuntu))
                 \\SERVER\Docs           Documents
                 \\SERVER\print$         Printer Drivers

sudo pdbedit -Lw
nobody:65534:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[U 
          ]:LCT-00000000:
user:1000:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:CC63D87C86C99FF2FB25B31C84CF584A:[U 
          ]:LCT-4C23B25F:
smbguest:1001:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[U 
          ]:LCT-00000000:

Thanks in advance for your time
Regards