π ~1 min read
Table of contents
Symptom & Impact
Domain users cannot log in, disrupting administration and application support tasks.
Environment & Reproduction
Occurs after directory outages, identity changes, or long offline periods on joined hosts.
Root Cause Analysis
Stale SSSD cache entries conflict with current directory data and block authentication.
Quick Triage
Verify directory reachability and check whether local accounts still authenticate correctly.
Step-by-Step Diagnosis
Inspect SSSD logs, test identity lookups, and validate Kerberos and LDAP configuration alignment.
Solution – Primary Fix
Purge invalid SSSD cache safely, restart related services, and revalidate directory identity resolution.
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Solution – Alternative Approaches
Enable controlled offline auth windows with cache timeout tuning for resilience.
Verification & Acceptance Criteria
Domain users authenticate reliably and group mappings resolve consistently.
Rollback Plan
Reapply previous SSSD settings if cache rebuild causes incomplete identity mapping.
Prevention & Hardening
Monitor SSSD health and directory latency; automate credential and cache validity checks.
Related Errors & Cross-Refs
Related issues include Kerberos clock skew and LDAP TLS trust failures.
Related tutorial: View the step-by-step tutorial for Ubuntu 16.04 LTS.
View all Ubuntu 16.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Review SSSD troubleshooting manuals and enterprise identity integration guidance.
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