[Samba] Samba share server loses groups information every week, it is authenticated to a Samba4 AD DC

Mario Pio Russo mariopiorusso at ie.ibm.com
Tue Aug 4 10:19:56 UTC 2015

Hi allVersion 3.5.6

I have a samba file share server , running on ubuntu 10. Samba version is

Originally this server was using a PDC server based on samba 3, and all was
ok. now the PDC server has been upgraded via samba-tool to version 4.2.2 .

The system itself works generally fine (afer a good amount of tuning and
configuration), however I am now incurring in a peculiar issue:

every week, at the weekend, the file share server Lose ALL the information
regarding the domain groups!

basically all the shares that are assigned for sharing, reports in the
group field the numeric version of the group, and not the name.
Furthermore, when I run getent group , it does NOT show any domain group.
NOTE that this does not happen for the users. specific domain users are
still associated with their corresponding directorys permissions,
furthermore getent passwd returns correctlly all the domain users.

this causes big problems as the users cannot access their directories as
the groups are not recognised.

the only way I am able to resolve this issue is to reboot the server every

I need some help in this way:

1) avoid that the groups are lost in the file share
2) find a way to re-associate the groups via command line without rebooting
the machine

Any help is well accepted, also let me know if you need any log or
configuration files.

thank you!

Mario Pio Russo, System Admin SWG IT Services Dublin, Phone & FAX: +353 1
815 2236, eMail: mariopiorusso at ie.ibm.com
IBM Ireland Product Distribution Limited registered in Ireland with number
92815. Registered Office: IBM House, Shelbourne Road, Ballsbridge, Dublin 4

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