Dear sssd users,

I observe that at each sssd start, the credentials cache is cleared. Is it an expected behavior ?
If yes, is there a parameter to make this caching permanent (or at least not erased at each sssd restart ).
My issue is that If I reboot my laptop without connection to my KDC, I am not able to log due to [sysdb_cache_auth] cached credentials not available.

here is my config : Debian testing / SSD version : 1.16.1

/etc/sssd/sssd.conf :
[sssd]
    services = nss, pam, ifp
    domains = ECCM.LAN

[pam]
    pam_verbosity = 2
    offline_credentials_expiration = 0

/etc/sssd/conf.d/01_ECCM_LAN.conf
[domain/ECCM.LAN]
    debug_level = 10
    id_provider = files
    auth_provider = krb5
    krb5_server = DebianCubox.eccm.lan
    krb5_realm = ECCM.LAN
    krb5_validate = true
    krb5_ccachedir = /var/tmp
    krb5_keytab = /etc/krb5.keytab
    krb5_store_password_if_offline = true

    cache_credentials = true

After a fresh reboot, I am able to log in only if the krb5_server is available.
As long as I do not restart the sssd daemon, I am able to log in.

The credentials caching seems to work properly as I see
" Authenticated with cache credentials " at each TTY console just before the usual loggin message.

But If restart the sssd daemon while disconnected from the network, I am not able to log in anymore. The credentials cache seems to have been cleared.

Here is the /var/log/sssd/krb5_child.log

(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [main] (0x0400): krb5_child started.
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [unpack_buffer] (0x1000): total buffer size: [128]
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [unpack_buffer] (0x0100): cmd [241] uid [1000] gid [1000] validate [true] enterprise principal [false] offline [true] UPN [cedric@ECCM.LAN]
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [unpack_buffer] (0x2000): No old ccache
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [unpack_buffer] (0x0100): ccname: [FILE:/var/tmp/krb5cc_1000_XXXXXX] old_ccname: [not set] keytab: [/etc/krb5.keytab]
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [check_use_fast] (0x0100): Not using FAST.
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [k5c_precreate_ccache] (0x4000): Recreating ccache
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [privileged_krb5_setup] (0x0080): Cannot open the PAC responder socket
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [become_user] (0x0200): Trying to become user [1000][1000].
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [main] (0x2000): Running as [1000][1000].
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [become_user] (0x0200): Trying to become user [1000][1000].
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [become_user] (0x0200): Already user [1000].
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [k5c_setup] (0x2000): Running as [1000][1000].
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [set_lifetime_options] (0x0100): No specific renewable lifetime requested.
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [set_lifetime_options] (0x0100): No specific lifetime requested.
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [main] (0x0400): Will perform offline auth
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [create_empty_ccache] (0x1000): Creating empty ccache
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [create_empty_cred] (0x2000): Created empty krb5_creds.
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [create_ccache] (0x4000): Initializing ccache of type [FILE]
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [create_ccache] (0x4000): returning: 0
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [k5c_send_data] (0x0200): Received error code 0
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [pack_response_packet] (0x2000): response packet size: [56]
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [k5c_send_data] (0x4000): Response sent.
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [main] (0x0400): krb5_child completed successfully

On /var/log/sssd/sssd_ECCM_LAN.log :

(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_dispatch] (0x4000): dbus conn: 0x560ea04b4be0
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_dispatch] (0x4000): Dispatching.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_message_handler] (0x2000): Received SBUS method org.freedesktop.sssd.dataprovider.getAccountInfo on path /org/freedesktop/sssd/dataprovider
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_get_sender_id_send] (0x2000): Not a sysbus message, quit
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_get_account_info_handler] (0x0200): Got request for [0x3][BE_REQ_INITGROUPS][name=files_initgr_request]
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sss_domain_get_state] (0x1000): Domain ECCM.LAN is Active

...

(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_attach_req] (0x0400): DP Request [Initgroups #2]: New request. Flags [0x0001].
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_attach_req] (0x0400): Number of active DP request: 1
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sss_domain_get_state] (0x1000): Domain ECCM.LAN is Active
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [files_account_info_handler_send] (0x1000): The files domain no longer needs an update
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_done] (0x0400): DP Request [Initgroups #2]: Request handler finished [0]: Succès
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [_dp_req_recv] (0x0400): DP Request [Initgroups #2]: Receiving request data.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_reply_list_success] (0x0400): DP Request [Initgroups #2]: Finished. Success.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_reply_std] (0x1000): DP Request [Initgroups #2]: Returning [Success]: 0,0,Success
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_table_value_destructor] (0x0400): Removing [0:1:0x0001:3::ECCM.LAN:name=files_initgr_request] from reply table
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_destructor] (0x0400): DP Request [Initgroups #2]: Request removed.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_destructor] (0x0400): Number of active DP request: 0
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_dispatch] (0x4000): dbus conn: 0x560ea04b4be0
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_dispatch] (0x4000): Dispatching.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_message_handler] (0x2000): Received SBUS method org.freedesktop.sssd.dataprovider.pamHandler on path /org/freedesktop/sssd/dataprovider
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sbus_get_sender_id_send] (0x2000): Not a sysbus message, quit
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_pam_handler] (0x0100): Got request with the following data
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): command: SSS_PAM_AUTHENTICATE
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): domain: ECCM.LAN
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): user: cedric@eccm.lan
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): service: login
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): tty: /dev/tty2
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): ruser:
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): rhost:
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): authtok type: 1
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): newauthtok type: 0
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): priv: 1
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): cli_pid: 8940
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [pam_print_data] (0x0100): logon name: not set
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_attach_req] (0x0400): DP Request [PAM Authenticate #3]: New request. Flags [0000].
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_attach_req] (0x0400): Number of active DP request: 1
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sss_domain_get_state] (0x1000): Domain ECCM.LAN is Active
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [krb5_auth_queue_send] (0x1000): Wait queue of user [cedric@eccm.lan] is empty, running request [0x560ea0455cc0] immediately.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [krb5_setup] (0x4000): No mapping for: cedric@eccm.lan
...
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [krb5_get_simple_upn] (0x4000): Using simple UPN [cedric@ECCM.LAN].
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [check_ccache_re] (0x1000): Ccache directory name [/var/tmp] does not contain illegal patterns.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [check_ccache_re] (0x1000): Ccache directory name [FILE:/var/tmp/krb5cc_1000_XXXXXX] does not contain illegal patterns.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [krb5_auth_prepare_ccache_name] (0x1000): No ccache file for user [cedric@eccm.lan] found.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [fo_resolve_service_send] (0x0100): Trying to resolve service 'KERBEROS'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [get_server_status] (0x1000): Status of server 'DebianCubox.eccm.lan' is 'name not resolved'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [get_port_status] (0x1000): Port status of port 0 for server 'DebianCubox.eccm.lan' is 'neutral'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [fo_resolve_service_activate_timeout] (0x2000): Resolve timeout set to 6 seconds
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [get_server_status] (0x1000): Status of server 'DebianCubox.eccm.lan' is 'name not resolved'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_is_address] (0x4000): [DebianCubox.eccm.lan] does not look like an IP address
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_step] (0x2000): Querying files
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_files_send] (0x0100): Trying to resolve A record of 'DebianCubox.eccm.lan' in files
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [set_server_common_status] (0x0100): Marking server 'DebianCubox.eccm.lan' as 'resolving name'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_step] (0x2000): Querying files
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_files_send] (0x0100): Trying to resolve AAAA record of 'DebianCubox.eccm.lan' in files
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_next] (0x0200): No more address families to retry
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_step] (0x2000): Querying DNS
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_dns_query] (0x0100): Trying to resolve A record of 'DebianCubox.eccm.lan' in DNS
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [schedule_request_timeout] (0x2000): Scheduling a timeout of 6 seconds
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [schedule_timeout_watcher] (0x2000): Scheduling DNS timeout watcher
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [unschedule_timeout_watcher] (0x4000): Unscheduling DNS timeout watcher
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [request_watch_destructor] (0x0400): Deleting request watch
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [resolv_gethostbyname_done] (0x0040): querying hosts database failed [5]: Erreur d'entrée/sortie
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [fo_resolve_service_done] (0x0020): Failed to resolve server 'DebianCubox.eccm.lan': Could not contact DNS servers
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [set_server_common_status] (0x0100): Marking server 'DebianCubox.eccm.lan' as 'not working'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_resolve_server_process] (0x0080): Couldn't resolve server (DebianCubox.eccm.lan), resolver returned [5]: Erreur d'entrée/sortie
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_resolve_server_process] (0x1000): Trying with the next one!
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [fo_resolve_service_send] (0x0100): Trying to resolve service 'KERBEROS'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [get_server_status] (0x1000): Status of server 'DebianCubox.eccm.lan' is 'not working'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [get_server_status] (0x1000): Status of server 'DebianCubox.eccm.lan' is 'not working'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [fo_resolve_service_send] (0x0020): No available servers for service 'KERBEROS'
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_resolve_server_done] (0x1000): Server resolution failed: [5]: Erreur d'entrée/sortie
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_mark_dom_offline] (0x1000): Marking back end offline
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_mark_offline] (0x2000): Going offline!
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_mark_offline] (0x2000): Initialize check_if_online_ptask.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [ldb] (0x4000): Added timed event "ltdb_callback": 0x560ea048ceb0
...
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_ptask_create] (0x0400): Periodic task [Check if online (periodic)] was created
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_ptask_schedule] (0x0400): Task [Check if online (periodic)]: scheduling task 73 seconds from now [1525171017]
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [be_run_offline_cb] (0x0080): Going offline. Running callbacks.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [child_handler_setup] (0x2000): Setting up signal handler up for pid [8942]
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [child_handler_setup] (0x2000): Signal handler set up for pid [8942]
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [write_pipe_handler] (0x0400): All data has been sent!
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [child_sig_handler] (0x1000): Waiting for child [8942].
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [child_sig_handler] (0x0100): child [8942] finished successfully.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [read_pipe_handler] (0x0400): EOF received, client finished
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [parse_krb5_child_response] (0x1000): child response [0][3][44].
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [krb5_mod_ccname] (0x4000): Save ccname [FILE:/var/tmp/krb5cc_1000_IBmIM5] for user [cedric@eccm.lan].
....
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [check_failed_login_attempts] (0x4000): Failed login attempts [0], allowed failed login attempts [0], failed login delay [5].
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [sysdb_cache_auth] (0x0100): Cached credentials not available.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [ldb] (0x4000): cancel ldb transaction (nesting: 0)
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [krb5_auth_cache_creds] (0x0020): Offline authentication failed
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [check_wait_queue] (0x1000): Wait queue for user [cedric@eccm.lan] is empty.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [krb5_auth_queue_done] (0x1000): krb5_auth_queue request [0x560ea0455cc0] done.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_done] (0x0400): DP Request [PAM Authenticate #3]: Request handler finished [0]: Succès
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [_dp_req_recv] (0x0400): DP Request [PAM Authenticate #3]: Receiving request data.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_destructor] (0x0400): DP Request [PAM Authenticate #3]: Request removed.
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_req_destructor] (0x0400): Number of active DP request: 0
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_method_enabled] (0x0400): Target selinux is not configured
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [dp_pam_reply] (0x1000): DP Request [PAM Authenticate #3]: Sending result [6][ECCM.LAN]
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [remove_krb5_info_files] (0x0200): Could not remove [/var/lib/sss/pubconf/kdcinfo.ECCM.LAN], [2][Aucun fichier ou dossier de ce type]
(Tue May  1 12:35:44 2018) [sssd[be[ECCM.LAN]]] [remove_krb5_info_files] (0x0200): Could not remove [/var/lib/sss/pubconf/kpasswdinfo.ECCM.LAN], [2][Aucun fichier ou dossier de ce type]

I am a bit confused with credentials cache which as far as I understood are stored in /var/lib/sss/db/ but looking at the logfile, it seems that the target of offline authentification is to find the kerberos ticket into /var/tmp ( by the way those tickets are still present after reboot). If as I understood the passwd is cached as a Hash key in the sss/db files, we should be able to be authenticated even if we do not have the kerberos ticket anymore isn't it ?

Actually, it seems that credentials cache cleaning erases the old_ccname if I look at the following log line :

(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [unpack_buffer] (0x2000): No old ccache
(Tue May  1 12:35:44 2018) [[sssd[krb5_child[8942]]]] [unpack_buffer] (0x0100): ccname: [FILE:/var/tmp/krb5cc_1000_XXXXXX] old_ccname: [not set] keytab: [/etc/krb5.keytab]

When the Offline authentication succeed, I observe the following krb5_child.log :

(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [main] (0x0400): krb5_child started.
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [unpack_buffer] (0x1000): total buffer size: [160]
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [unpack_buffer] (0x0100): cmd [241] uid [1000] gid [1000] validate [true] enterprise principal [false] offline [true] UPN [cedric@ECCM.LAN]
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [unpack_buffer] (0x0100): ccname: [FILE:/var/tmp/krb5cc_1000_XXXXXX] old_ccname: [FILE:/var/tmp/krb5cc_1000_vbmc1v] keytab: [/etc/krb5.keytab]
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [check_use_fast] (0x0100): Not using FAST.
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [switch_creds] (0x0200): Switch user to [1000][1000].
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [switch_creds] (0x0200): Switch user to [0][0].
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [k5c_check_old_ccache] (0x4000): Ccache_file is [FILE:/var/tmp/krb5cc_1000_vbmc1v] and is  active and TGT is  valid.
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [privileged_krb5_setup] (0x0080): Cannot open the PAC responder socket
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [become_user] (0x0200): Trying to become user [1000][1000].
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [main] (0x2000): Running as [1000][1000].
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [become_user] (0x0200): Trying to become user [1000][1000].
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [become_user] (0x0200): Already user [1000].
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [k5c_setup] (0x2000): Running as [1000][1000].
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [set_lifetime_options] (0x0100): No specific renewable lifetime requested.
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [set_lifetime_options] (0x0100): No specific lifetime requested.
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [main] (0x0400): Will perform offline auth
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [create_empty_ccache] (0x1000): Existing ccache still valid, reusing
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [k5c_send_data] (0x0200): Received error code 0
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [pack_response_packet] (0x2000): response packet size: [56]
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [k5c_send_data] (0x4000): Response sent.
(Tue May  1 13:17:16 2018) [[sssd[krb5_child[10318]]]] [main] (0x0400): krb5_child completed successfully

(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [fo_resolve_service_send] (0x0020): No available servers for service 'KERBEROS'
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [be_resolve_server_done] (0x1000): Server resolution failed: [5]: Erreur d'entrée/sortie
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [be_mark_dom_offline] (0x1000): Marking back end offline
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [be_mark_offline] (0x2000): Going offline!
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [be_mark_offline] (0x2000): Enable check_if_online_ptask.
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [be_ptask_enable] (0x0400): Task [Check if online (periodic)]: enabling task
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [be_ptask_schedule] (0x0400): Task [Check if online (periodic)]: scheduling task 80 seconds from now [1525174023]
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [be_run_offline_cb] (0x0080): Going offline. Running callbacks.
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [child_handler_setup] (0x2000): Setting up signal handler up for pid [10471]
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [child_handler_setup] (0x2000): Signal handler set up for pid [10471]
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [write_pipe_handler] (0x0400): All data has been sent!
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [read_pipe_handler] (0x0400): EOF received, client finished
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [parse_krb5_child_response] (0x1000): child response [0][3][44].
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [krb5_mod_ccname] (0x4000): Save ccname [FILE:/var/tmp/krb5cc_1000_vbmc1v] for user [cedric@eccm.lan].
....
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [sysdb_set_entry_attr] (0x0200): Entry [name=cedric@eccm.lan,cn=users,cn=ECCM.LAN,cn=sysdb] has set [ts_cache] attrs.

(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [check_failed_login_attempts] (0x4000): Failed login attempts [0], allowed failed login attempts [0], failed login delay [5].
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [sysdb_cache_auth] (0x0100): Hashes do match!
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [ldb] (0x4000): commit ldb transaction (nesting: 0)
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [add_user_to_delayed_online_authentication] (0x4000): Saved authtok of user [cedric@eccm.lan] with serial [184462369].
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [add_user_to_delayed_online_authentication] (0x4000): Added user [cedric@eccm.lan] successfully to delayed online authentication.
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [check_wait_queue] (0x1000): Wait queue for user [cedric@eccm.lan] is empty.
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [krb5_auth_queue_done] (0x1000): krb5_auth_queue request [0x55ffb8dee140] done.
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [authenticate_user_done] (0x0020): Failed to authenticate user [cedric@eccm.lan].
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [child_sig_handler] (0x1000): Waiting for child [10471].
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [child_sig_handler] (0x0100): child [10471] finished successfully.
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [remove_krb5_info_files] (0x0200): Could not remove [/var/lib/sss/pubconf/kdcinfo.ECCM.LAN], [2][Aucun fichier ou dossier de ce type]
(Tue May  1 13:25:43 2018) [sssd[be[ECCM.LAN]]] [remove_krb5_info_files] (0x0200): Could not remove [/var/lib/sss/pubconf/kpasswdinfo.ECCM.LAN], [2][Aucun fichier ou dossier de ce type]

Thanks a lot for your help.
Regards
Cedric