🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: RHEL 10.0 RHEL 10.1

📖 ~1 min read

Table of contents
  1. Problem Summary
  2. Symptoms
  3. Diagnostics
  4. Root Cause
  5. Primary Fix
  6. Verification
  7. Prevention
  8. Rollback
  9. Automation
  10. Command Reference
  11. Escalation
  12. Related Notes

Problem Summary

Domain users cannot log in during directory service outages.

Symptoms

pam_sss errors and delayed logins appear in logs.

Diagnostics

Check sssd.conf cache settings and journalctl -u sssd.

Root Cause

Offline cache expired or host clock skew invalidates tickets.

Primary Fix

Tune cache_credentials and offline_timeout, ensure chronyd sync.

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Illustrative mockup for rhel-10 — rhel10-b02-p48-1
Illustrative mockup — Progressive Robot — Illustrative mockup — Progressive Robot

Verification

Simulate directory outage and test cached login success.

Illustrative mockup for rhel-10 — rhel10-b02-p48-2
Illustrative mockup — Progressive Robot — Illustrative mockup — Progressive Robot

Prevention

Monitor identity provider latency and cache hit rates.

Rollback

Restore prior sssd.conf and restart service if regressions occur.

Automation

Apply SSSD profile templates with environment-specific thresholds.

Command Reference

sssctl domain-status; systemctl restart sssd; timedatectl

Escalation

Share anonymized sssd logs and domain topology.

SELinux contexts for /var/lib/sss must remain intact.

Related tutorial: View the step-by-step tutorial for rhel-10.

View all rhel-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

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