SSSD service is failing with an error 'Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed.'

Solution Verified - Updated -


  • SSSD service is failing.
  • RHEL system is configured as an AD client using SSSD and AD users are unable to login to the system.
  • /var/log/messages file is filled up with following repeated logs.
Mar 13 08:36:18 testserver [sssd[ldap_child[145919]]]: Failed to initialize credentials using keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create GSSAPI-encrypted LDAP connection.


  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

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