LDAP login fails, SSSD is used and unencrypted LDAP

Solution Verified - Updated -

Issue

A customer run a server used as both an LDAP server and client with sssd. After OS reboot, LDAP login mostly fails and the following message is output. It rarely succeeds.

In /var/log/secure:

pam_sss(sshd:auth): received for user ****: 4 (System error)

Using su to change into the user also fails.

Environment

  • Red Hat Enterprise Linux (RHEL) 6 and 7
  • LDAP
  • System Security Services Daemon (SSSD)

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