SSSD code 1: could not resolve domain of Active Directory

I have luckily the same error suddenly today: Account provider generic error: SSSD exit code 1, and noone is able to login to SOGo, Nextcloud etc…
I did not touch the server the past few weeks in regards of updates.
Could someone please tell me what the solution here was?
I looked also at the post SSSD ldap error: Cannot contact any KDC but it is unclear to me what has to be done to fix the issue.
Do I have to delete the file /var/lib/machines/nsdc/var/lib/samba/private/krb5.conf and then run a config restore?

Those errors are in message logs:

Jun 11 23:40:17 core sssd: tkey query failed: GSSAPI error: Major = Unspecified GSS failure. Minor code may provide more information, Minor = Server not found in Kerberos database.

Jun 12 01:03:55 core httpd: [ERROR] NethServer\Tool\GroupProvider: Account provider generic error: SSSD exit code 1
Jun 12 01:03:55 core httpd: [ERROR] Could not resolve domain ad.domannamehere.com Jun 12 01:04:00 core admin-todos: [ERROR] admin-todos: /etc/nethserver/todos.d/20ad_credentials exit code 31744

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@hector had a similar problem in the past days: Samba is not working (SSSD accountsprovider error)

We tried to troubleshoot it. You can find some commands to gather more info: please have a look at it and ask for any doubt!

Your error is different

Thanks everyone for the good tips.
There seems to be a ghost in my server, cause the issue disappeared without me doing anything at all, apart from rebooting few times yesterday evening.
Anyhow, if it comes back, I know what steps to try and post the results here.

A reboot is recommended by upstream release notes. Why did you say “few times”? One is not enough?

Hope is last to die. After rebooting the first time nothing changed, nor did it after the 3rd, but…

Can you give more info about your installation?

Please attach the output of

yum history pkg-info nethserver-dc
last -50

sure
output of yum history pkg-info nethserver-dc:

Loaded plugins: changelog, fastestmirror, nethserver_events
Transaction ID : 16
Begin time     : Tue May 29 12:59:58 2018
Package        : nethserver-dc-1.5.0-1.ns7.x86_64
State          : Updated
Size           : 14,584,075
Build host     : b41.nethserver.org
Build time     : Thu Apr 26 14:26:52 2018
License        : GPLv3+
URL            : http://github.com/NethServer/nethserver-dc
Source RPM     : nethserver-dc-1.5.0-1.ns7.src.rpm                                                                                                                      
Commit Time    : Thu Apr 26 13:00:00 2018                                                                                                                               
Committer      : Davide Principi <davide.principi@nethesis.it>                                                                                                          
Reason         : user                                                                                                                                                   
From repo      : nethserver-updates                                                                                                                                     
Installed by   : System <unset>                                                                                                                                         
                                                                                                                                                                        
Transaction ID : 16                                                                                                                                                     
Begin time     : Tue May 29 12:59:58 2018                                                                                                                               
Package        : nethserver-dc-1.5.1-1.ns7.x86_64                                                                                                                       
State          : Update                                                                                                                                                 
Size           : 14,584,402                                                                                                                                             
Build host     : b47.nethserver.org                                                                                                                                     
Build time     : Tue May 15 17:01:48 2018                                                                                                                               
License        : GPLv3+                                                                                                                                                 
URL            : http://github.com/NethServer/nethserver-dc
Source RPM     : nethserver-dc-1.5.1-1.ns7.src.rpm
Commit Time    : Tue May 15 13:00:00 2018
Committer      : Davide Principi <davide.principi@nethesis.it>
Reason         : user
From repo      : nethserver-base
Installed by   : System <unset>
Changed by     : System <unset>

Transaction ID : 3
Begin time     : Sat May 12 14:52:37 2018
Package        : nethserver-dc-1.5.0-1.ns7.x86_64
State          : Install
Size           : 14,584,075
Build host     : b41.nethserver.org
Build time     : Thu Apr 26 14:26:52 2018
License        : GPLv3+
URL            : http://github.com/NethServer/nethserver-dc
Source RPM     : nethserver-dc-1.5.0-1.ns7.src.rpm
Commit Time    : Thu Apr 26 13:00:00 2018
Committer      : Davide Principi <davide.principi@nethesis.it>
Reason         : user
From repo      : nethserver-updates
Installed by   : System <unset>
history pkg-info

output of last -50:

root     pts/0        pc.............. Tue Jun 12 22:02   still logged in   
root     pts/0        pc.............. Tue Jun 12 21:59 - 22:02  (00:02)    
reboot   system boot  3.10.0-862.3.2.e Tue Jun 12 02:32 - 22:05  (19:33)    
reboot   system boot  3.10.0-862.3.2.e Tue Jun 12 02:01 - 01:32  (00:-29)   
reboot   system boot  3.10.0-862.3.2.e Tue Jun 12 01:51 - 01:32  (00:-19)   
root     pts/0        192.168.1.222    Tue Jun 12 00:49 - down   (00:01)    
reboot   system boot  3.10.0-862.3.2.e Tue Jun 12 01:41 - 00:50  (00:-50)   
root     pts/0        192.168.1.222    Tue Jun 12 00:17 - 00:36  (00:18)    
reboot   system boot  3.10.0-862.3.2.e Tue Jun 12 00:50 - 00:40  (00:-9)    
reboot   system boot  3.10.0-862.3.2.e Tue Jun 12 00:48 - 00:40  (00:-7)    
reboot   system boot  3.10.0-862.3.2.e Tue Jun 12 00:38 - 00:40  (00:02)    
root     pts/0        pc.............. Thu May 24 10:17 - 00:08  (13:51)    
root     pts/0        192.168.1.222    Mon May 21 23:35 - 02:47  (03:11)    
root     pts/0        pc.............. Sun May 20 02:19 - 02:34  (00:14)    
root     pts/0        pc.............. Tue May 15 02:51 - 03:06  (00:15)    
root     pts/0        pc.............. Tue May 15 00:10 - 02:36  (02:25)    
reboot   system boot  3.10.0-862.2.3.e Mon May 14 23:27 - 00:40 (28+01:13)  
reboot   system boot  3.10.0-862.2.3.e Mon May 14 23:20 - 00:40 (28+01:20)  
root     pts/0        pc.............. Mon May 14 21:33 - 21:41  (00:08)    
root     pts/0        pc.............. Mon May 14 19:19 - 20:01  (00:41)    
root     pts/0        pc.............. Mon May 14 14:34 - 17:07  (02:32)    
root     pts/0        pc.............. Mon May 14 12:47 - 12:49  (00:01)    
reboot   system boot  3.10.0-862.2.3.e Mon May 14 00:32 - 21:42  (21:09)    
root     pts/0        pc.............. Sun May 13 01:57 - 12:07  (10:09)    
reboot   system boot  3.10.0-862.2.3.e Sun May 13 01:50 - 12:47  (10:56)    
reboot   system boot  3.10.0-862.2.3.e Sun May 13 01:29 - 00:49  (00:-39)   
root     pts/0        pc.............. Sat May 12 23:51 - 00:04  (00:13)    
reboot   system boot  3.10.0-862.2.3.e Sun May 13 00:46 - 00:49  (00:03)    
reboot   system boot  3.10.0-862.2.3.e Sat May 12 15:45 - 00:49  (09:04)    
reboot   system boot  3.10.0-693.el7.x Sat May 12 14:18 - 00:49  (10:31)
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