当我运行时，systemctl status sssd我会收到两条消息中的一条。有人能告诉我这是什么意思以及如何修复它吗？
● sssd.service - System Security Services Daemon
Loaded: loaded (/lib/systemd/system/sssd.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2020-05-29 13:48:37 EDT; 2 days ago
Main PID: 732 (sssd)
Tasks: 5 (limit: 4915)
CGroup: /system.slice/sssd.service
├─ 732 /usr/sbin/sssd -i --logger=files
├─1364 /usr/lib/x86_64-linux-gnu/sssd/sssd_be --domain hc2.local --uid 0 --gid 0 --logger=files
├─1451 /usr/lib/x86_64-linux-gnu/sssd/sssd_nss --uid 0 --gid 0 --logger=files
├─1452 /usr/lib/x86_64-linux-gnu/sssd/sssd_pam --uid 0 --gid 0 --logger=files
└─1454 /usr/lib/x86_64-linux-gnu/sssd/sssd_ssh --uid 0 --gid 0 --logger=files
Jun 01 10:13:31 ubad-t1 [sssd[ldap_child[30242]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:14:34 ubad-t1 [sssd[ldap_child[30248]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:15:46 ubad-t1 [sssd[ldap_child[30250]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:15:47 ubad-t1 [sssd[ldap_child[30251]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:17:05 ubad-t1 [sssd[ldap_child[30255]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:17:05 ubad-t1 [sssd[ldap_child[30256]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:18:15 ubad-t1 [sssd[ldap_child[30258]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:18:15 ubad-t1 [sssd[ldap_child[30259]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:19:34 ubad-t1 [sssd[ldap_child[30269]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
Jun 01 10:19:34 ubad-t1 [sssd[ldap_child[30270]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
或者：
● sssd.service - System Security Services Daemon
Loaded: loaded (/lib/systemd/system/sssd.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2020-05-29 10:42:10 EDT; 2 days ago
Main PID: 817 (sssd)
CGroup: /system.slice/sssd.service
├─ 817 /usr/sbin/sssd -i --logger=files
├─1244 /usr/lib/x86_64-linux-gnu/sssd/sssd_be --domain hc2.local --uid 0 --gid 0 --logger=files
├─1285 /usr/lib/x86_64-linux-gnu/sssd/sssd_nss --uid 0 --gid 0 --logger=files
├─1287 /usr/lib/x86_64-linux-gnu/sssd/sssd_pam --uid 0 --gid 0 --logger=files
└─1288 /usr/lib/x86_64-linux-gnu/sssd/sssd_ssh --uid 0 --gid 0 --logger=files
Jun 01 10:16:49 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:18:06 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:18:06 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:19:19 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:19:22 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:19:22 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:20:25 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:20:26 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:21:53 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
Jun 01 10:21:53 ubad-t2 sssd[be[1244]: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)