sssd pam_sss errors : "received for user <user>: 4 (System error)" are seen occuring randomly after upgrade

Solution Unverified - Updated -

Issue

After upgrading sssd, authentication errors may be observed on a busy system.

Following errors are seen in /var/log/secure

pam_sss(server:auth): authentication failure; logname= uid=xxxx euid=xxxx tty= ruser= rhost= user=xxx
pam_sss(server:auth): received for user user1: 4 (System error)

Environment

  • Red Hat Enterprise Linux 6.5 upgraded to Red Hat Enterprise Linux 6.6
  • sssd upgraded from 1.9.2-129 to 1.11.6-30 or later

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