Servidor SMB não funciona após a atualização de 3.5 para 3.6

Question

nossos clientes do Windows 7/2008 não podem mais acessar nosso servidor samba após a atualização para a versão 3.6.

Isso é no CentOS 6 ( rpm --query centos-release reports centos-release-6-7.el6.centos.12.3.x86_64 ).

Isso é o que eu vejo nos logs do samba:

[2016/04/18 15:11:53.564262,  0] auth/check_samsec.c:492(check_sam_security)
check_sam_security: make_server_info_sam() failed with 'NT_STATUS_UNSUCCESSFUL'

e este é o meu arquivo smb.conf:

#======================= Global Settings =====================================

[global]

# ----------------------- Network Related Options -------------------------

    workgroup = WOLFPACK
    server string = Wolfpack Samba Server Version %v

    interfaces = lo 10.0.0.0/16 129.94.136.0/25 192.168.11.0/24
    hosts allow = 127. 10.0. 129.94. 192.168. 149.171.

    map untrusted to domain = yes

# --------------------------- Logging Options -----------------------------

    # logs split per machine
    log file = /var/log/samba/log.%m
    # max 50KB per log file, then rotate
    max log size = 50

# ----------------------- Standalone Server Options ------------------------

#       security = user
#       passdb backend = ldapsam:ldap://XXX.XXX.XXX.XXX:YYY
#       ldap suffix =  dc=XXX,dc=XXX,dc=XXX,dc=XXX
#       ldap suffix =
#       ldap user suffix = ou=People
#       ldap group suffix = ou=Group
#       ldap admin dn = cn=XXX,ou=XXX,dc=XXX,dc=XXX,dc=XXX,dc=XXX
#       ldap ssl = no
#       ldap passwd sync = no
#       ldap delete dn = no

#       deadtime = 10

    idmap config * : backend      = ldap
    idmap config * : range        = 1000000-1999999
    idmap config * : ldap_url     = ldap://XXX.XXX.XXX.XXX:YYY
    idmap config * : ldap_base_dn = cn=XXX,ou=XXX,dc=XXX,dc=XXX,dc=XXX,dc=XXX
    idmap config * : ldap_user_dn = cn=XXX,ou=XXX,dc=XXX,dc=XXX,dc=XXX,dc=XXX

#============================ Share Definitions ==============================

[temp]
    comment = PanFS temp vol via smb
    path = /directflow/Temp
    public = no
    valid users = XXXX
    writable = yes
    browseable = yes
    create mask = 0644
    force create mode = 0644
    directory mask = 0755
    force directory mode = 0755
    share modes = yes

[runs]
    comment = PanFS RUNS vol via smb
    path = /directflow/RUNS
    public = no
    valid users = XXXXX
    write list = user1
    writable = no
    browseable = yes
    create mask = 0644
    force create mode = 0644
    directory mask = 0755
    force directory mode = 0755
    share modes = yes

[tmp]
    comment = Server local tmp via smb
    path = /tmp
    public = no
    valid users = XXXXX
    write list = user1
    writable = no
    browseable = yes
    create mask = 0644
    force create mode = 0644
    directory mask = 0755
    force directory mode = 0755
    share modes = yes

Isso é o que eu recebo quando executo o comando net getdomainsid

Failed to open /var/lib/samba/private/secrets.tdb
Unable to open secrets.tdb.  Can't fetch domain SID for name: XXXX

EDIT: mais informações

pwbcad@r815:~$ pdbedit -L
tdbsam_open: Failed to open/create TDB passwd [/var/lib/samba/private/passdb.tdb]
tdbsam_getsampwnam: failed to open /var/lib/samba/private/passdb.tdb!
User Search failed!

e

$ smbclient -U USER \\localhost\<username>
Enter USER's password:
session setup failed: NT_STATUS_LOGON_FAILURE

executando /usr/bin/smbpasswd -w ldap_pwd não ajudou

Qualquer sugestão seria muito apreciada