Manually trying this out gets me:
Failed to start authentication backend: NT_STATUS_INTERNAL_ERROR at /usr/share/perl5/vendor_perl/NethServer/LdapClient.pm line 126.
This seems relevant.
Var/log/messages: (Excerpt)
This looks good:
Oct 23 18:00:13 bhzh-nethserver esmith::event[4083]: Event: post-backup-config
Oct 23 18:00:13 bhzh-nethserver esmith::event[4083]: Action: /etc/e-smith/events/post-backup-config/S40nethserver-dc-post-backup SUCCESS [0.032782]
Oct 23 18:00:13 bhzh-nethserver esmith::event[4083]: Event: post-backup-config SUCCESS
Oct 23 18:00:13 bhzh-nethserver esmith::event[3715]: Action: /etc/e-smith/events/pre-backup-data/S20nethserver-backup-config-predatabackup SUCCESS [10.867141]
But later on:
Oct 23 18:08:41 bhzh-nethserver httpd: [ERROR] NethServer\Tool\GroupProvider: Account provider generic error: SSSD exit code 1
Oct 23 18:08:41 bhzh-nethserver httpd: [ERROR] (1) SASL:[GSSAPI]: Failed to start authentication backend: NT_STATUS_INTERNAL_ERROR at /usr/share/perl5/vendor_perl/NethServer/LdapClient.pm line 126.
Oct 23 18:08:44 bhzh-nethserver admin-todos: (1) SASL:[GSSAPI]: Failed to start authentication backend: NT_STATUS_INTERNAL_ERROR at /usr/share/perl5/vendor_perl/NethServer/LdapClient.pm line 126.
Oct 23 18:09:02 bhzh-nethserver httpd: [ERROR] NethServer\Tool\GroupProvider: Account provider generic error: SSSD exit code 1
Oct 23 18:09:02 bhzh-nethserver httpd: [ERROR] (1) SASL:[GSSAPI]: Failed to start authentication backend: NT_STATUS_INTERNAL_ERROR at /usr/share/perl5/vendor_perl/NethServer/LdapClient.pm line 126.
Oct 23 18:09:03 bhzh-nethserver sshd[4959]: Connection closed by 192.168.203.29 port 52054 [preauth]
Oct 23 18:09:05 bhzh-nethserver admin-todos: (1) SASL:[GSSAPI]: Failed to start authentication backend: NT_STATUS_INTERNAL_ERROR at /usr/share/perl5/vendor_perl/NethServer/LdapClient.pm line 126.