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[Samba] Failed to find domain 'NT AUTHORITY'




Hello,
I recently set up a new software to backup samba share.
This software ( https://github.com/borgbackup/borg ) run on file server as
root cron script during the night and save file on external NAS.

The problem I have is that for each file copied from
samba share to external NAS, winbindd log an error
such this to samba.log.winbindd and /var/log/messages

[2017/11/06 11:05:16.747449, 0] ../source3/winbindd/winbindd_group.c:45(fill_grent) Failed to find domain 'NT AUTHORITY'. Check connection to trusted domains!

thousends lines !!! ( 2 lines for each file )
This problem also slow down the backup process.

This happen only on share named [utenti] ( home share ) and not
on share [gruppi].

this is the winbindd log output at log level 5

[2017/11/06 14:58:04.800302, 3] ../source3/winbindd/winbindd_misc.c:395(winbindd_interface_version)
  [27319]: request interface version (version = 28)
[2017/11/06 14:58:04.800377, 3] ../source3/winbindd/winbindd_misc.c:428(winbindd_priv_pipe_dir)
  [27319]: request location of privileged pipe
[2017/11/06 14:58:04.800498, 3] ../source3/winbindd/winbindd_getpwuid.c:49(winbindd_getpwuid_send)
  getpwuid 3000033
[2017/11/06 14:58:04.815079, 3] ../source3/winbindd/winbindd_getpwuid.c:49(winbindd_getpwuid_send)
  getpwuid 3000000
[2017/11/06 14:58:04.820655, 5] ../source3/winbindd/winbindd_getpwuid.c:111(winbindd_getpwuid_recv)
  Could not convert sid S-1-5-32-544: NT_STATUS_NO_SUCH_USER
[2017/11/06 14:58:04.820845, 3] ../source3/winbindd/winbindd_getpwuid.c:49(winbindd_getpwuid_send)
  getpwuid 3000002
[2017/11/06 14:58:04.826444, 5] ../source3/winbindd/winbindd_getpwuid.c:111(winbindd_getpwuid_recv)
  Could not convert sid S-1-5-18: NT_STATUS_NO_SUCH_USER
[2017/11/06 14:58:04.826582, 3] ../source3/winbindd/winbindd_getpwuid.c:49(winbindd_getpwuid_send)
  getpwuid 3000008
[2017/11/06 14:58:04.832246, 5] ../source3/winbindd/winbindd_getpwuid.c:111(winbindd_getpwuid_recv) Could not convert sid S-1-5-21-1853045328-2428526881-2616184179-512: NT_STATUS_NO_SUCH_USER [2017/11/06 14:58:04.832357, 3] ../source3/winbindd/winbindd_getpwuid.c:49(winbindd_getpwuid_send)
  getpwuid 3000033
[2017/11/06 14:58:04.838453, 3] ../source3/winbindd/winbindd_getgrgid.c:52(winbindd_getgrgid_send)
  getgrgid 3000000
[2017/11/06 14:58:04.844045, 3] ../source3/winbindd/winbindd_getgrgid.c:52(winbindd_getgrgid_send)
  getgrgid 3000002
[2017/11/06 14:58:04.849482, 0] ../source3/winbindd/winbindd_group.c:45(fill_grent) Failed to find domain 'NT AUTHORITY'. Check connection to trusted domains! [2017/11/06 14:58:04.849528, 5] ../source3/winbindd/winbindd_getgrgid.c:122(winbindd_getgrgid_recv)
  fill_grent failed
[2017/11/06 14:58:04.849641, 3] ../source3/winbindd/winbindd_getgrgid.c:52(winbindd_getgrgid_send)
  getgrgid 3000008
[2017/11/06 14:58:04.854863, 3] ../source3/winbindd/winbindd_getgrgid.c:52(winbindd_getgrgid_send)
  getgrgid 3000008
[2017/11/06 14:58:04.860567, 3] ../source3/winbindd/winbindd_getgrgid.c:52(winbindd_getgrgid_send)
  getgrgid 3000033
[2017/11/06 14:58:04.866466, 3] ../source3/winbindd/winbindd_getpwnam.c:56(winbindd_getpwnam_send)
  getpwnam 3000000
[2017/11/06 14:58:04.872322, 5] ../source3/winbindd/winbindd_getpwnam.c:137(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_NONE_MAPPED
[2017/11/06 14:58:04.872476, 3] ../source3/winbindd/winbindd_getpwnam.c:56(winbindd_getpwnam_send)
  getpwnam 3000002
[2017/11/06 14:58:04.878349, 5] ../source3/winbindd/winbindd_getpwnam.c:137(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_NONE_MAPPED
[2017/11/06 14:58:04.878500, 3] ../source3/winbindd/winbindd_getpwnam.c:56(winbindd_getpwnam_send)
  getpwnam 3000008
[2017/11/06 14:58:04.884406, 5] ../source3/winbindd/winbindd_getpwnam.c:137(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_NONE_MAPPED
[2017/11/06 14:58:04.884571, 3] ../source3/winbindd/winbindd_getpwnam.c:56(winbindd_getpwnam_send)
  getpwnam APAM-AD\134garvati
[2017/11/06 14:58:04.890192, 5] ../source3/winbindd/winbindd_getpwnam.c:137(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_NONE_MAPPED
[2017/11/06 14:58:04.890485, 3] ../source3/winbindd/winbindd_getgrnam.c:56(winbindd_getgrnam_send)
  getgrnam BUILTIN\134administrators
[2017/11/06 14:58:04.896378, 5] ../source3/winbindd/winbindd_getgrnam.c:157(winbindd_getgrnam_recv)
  Could not convert sid S-0-0: NT_STATUS_NONE_MAPPED
[2017/11/06 14:58:04.896527, 3] ../source3/winbindd/winbindd_getgrnam.c:56(winbindd_getgrnam_send)
  getgrnam 3000002
[2017/11/06 14:58:04.902694, 5] ../source3/winbindd/winbindd_getgrnam.c:157(winbindd_getgrnam_recv)
  Could not convert sid S-0-0: NT_STATUS_NONE_MAPPED


-----------------
Linux version 2.6.32-642.13.1.el6.x86_64
CentOS release 6.8 (Final)
samba 4.6.9 AD DC
-------------------
smb.conf
# Global parameters
[global]
        workgroup = APAM-AD
        realm = apam-ad.apam.it
        netbios name = APAMFS2
        server role = active directory domain controller
server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbind, ntp_signd, kcc, dnsupdate
        idmap_ldb:use rfc2307 = yes
        printing = bsd
        printcap name = /dev/null
        load printers = no
        log file = /usr/local/samba/var/samba.log.%m
        log level = 0
        winbind enum users = yes
        winbind enum groups = yes

[netlogon]
        path = /usr/local/samba/var/locks/sysvol/apam-ad.apam.it/scripts
        read only = No

[sysvol]
        path = /usr/local/samba/var/locks/sysvol
        read only = No

[utenti]
        path = /dati/utenti
        read only = No
        directory mask = 700
        create mask = 700
        vfs object = recycle
        recycle:repository = /dati/utenti/%U/.recycle
        recycle:keeptree = yes
        recycle:exclude = *.tmp, *.bak, ~*, *#, *.mp3, *.mp4
        recycle:maxsize = 10485760
        recycle:exclude_dir = .recycle

[gruppi]
        path = /dati/gruppi
        read only = No
        create mask = 770


Can someone help me ?

thank you

giuseppe

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