🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: RHEL 10

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution — Primary Fix
  7. Solution — Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

Domain logins fail or use stale cache even though network connectivity has returned.

Environment & Reproduction

Seen after prolonged DNS outage or identity provider unreachability.

id user@domain ; systemctl status sssd

Root Cause Analysis

SSSD cache/state does not recover cleanly due to DNS, time, or backend service issues.

Quick Triage

Check SSSD logs, DNS records, and Kerberos time alignment.

sudo journalctl -u sssd -n 150 ; getent hosts idp.domain ; timedatectl status

Step-by-Step Diagnosis

Inspect domain section config and backend status with sssctl tools.

sudo sssctl domain-status domain ; sudo sssctl cache-status ; grep -v '^#' /etc/sssd/sssd.conf
Illustrative mockup for rhel-10 — sssd-offline-log
SSSD remains in offline mode — Illustrative mockup — Progressive Robot

Solution — Primary Fix

Clear stale SSSD cache and restart service after DNS/time are confirmed healthy.

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sudo systemctl stop sssd ; sudo rm -f /var/lib/sss/db/* ; sudo systemctl start sssd ; sudo sssctl cache-expire -E
Illustrative mockup for rhel-10 — sssd-offline-fix
SSSD reconnects to identity provider — Illustrative mockup — Progressive Robot

Solution — Alternative Approaches

Temporarily allow local break-glass accounts while identity backend is stabilized.

Verification & Acceptance Criteria

Domain identity lookups and logins succeed with fresh backend responses.

id user@domain ; getent passwd user@domain ; sudo journalctl -u sssd -n 50

Rollback Plan

Restore prior SSSD cache backup if cache reset introduces unexpected mapping issues.

Prevention & Hardening

Monitor SSSD offline transitions and ensure resilient DNS/time dependencies.

Closely tied to chronyd drift and resolver misconfiguration incidents.

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.

References & Further Reading

RHEL identity management and SSSD troubleshooting documentation.

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