Problema con Samba

[BlackBird]

Salve tutti, ho qualche problema per aggiugere un utente a samba.... Adduser funziona, quando volevo mettere la password (nulla) all'utente guest mi visualizza il seguente errore:

[root@localhost script]# smbpasswd guest
New SMB password:
Retype new SMB password:
fetch_ldap_pw: neither ldap secret retrieved!
ldap_connect_system: Failed to retrieve password from secrets.tdb
Connection to LDAP Server failed for the 1 try!
smbldap_search_suffix: Problem during the LDAP search: (unknown) (Invalid credentials)
fetch_ldap_pw: neither ldap secret retrieved!
ldap_connect_system: Failed to retrieve password from secrets.tdb
Connection to LDAP Server failed for the 1 try!
smbldap_search_suffix: Problem during the LDAP search: (unknown) (Invalid credentials)
Failed to modify entry for user guest.
Failed to modify password entry for user guest 

Cosa vuole!?!??
Allego anche il mio file smb.conf

[global]

workgroup = ALMA
netbios name= firewall
server string = Pc RedHat Firewall %v

hosts allow = 192.168. localhost
bind interfaces only = yes 

printing = bsd
printcap name = /etc/printcap
load printers = yes

log file = /var/log/samba/%m.log
max log size = 500
log level = 3

encrypt passwords = yes
null passwords = yes 
security = share 
smb passwd file = /etc/samba/smbpasswd

template homedir=/home/%D/%U
template shell = /bin/bash
guest account = guest
obey pam restrictions = yes
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
dns proxy = no 

[homes]
   comment = Home Directories
   browseable = no
   writable = yes
   valid users = %S
   create mode = 0664
   directory mode = 0775

[NETLOGON]
  path= /opt/samba/netlogon
  read only = yes

[cd]
  comment  = Unità cd rom Firewall
  preexec  = mount /mnt/cdrom
  postexec = umont /mnt/cdrom
  browseable = yes
  public = yes
  path = /mnt/cdrom
  writeable = no

[public]
  comment = Cartella condivisa (pubblica)
  path = /home/public
  browseable = yes
  writable = yes
  public = yes
  guest ok = yes 

Spero che qualcuno mi possa aiutare!
Grazie





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