π ~1 min read
Table of contents
Symptom & Impact
TLS sessions and Kerberos-like auth flows fail unpredictably.
Environment & Reproduction
VM with paused states and inconsistent upstream time sources.
Root Cause Analysis
Clock skew exceeds acceptable tolerance for crypto validation.
Quick Triage
Compare system time against trusted reference and peer status.
Step-by-Step Diagnosis
Check timedatectl and chrony statistics for synchronization health.
Solution – Primary Fix
Configure reliable NTP peers and force immediate time correction.
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Solution – Alternative Approaches
Use hardware clock adjustments or hypervisor time integration.
Verification & Acceptance Criteria
Offset remains stable and auth failures stop recurring.
Rollback Plan
Revert chrony configuration and return to previous time source.
Prevention & Hardening
Monitor drift thresholds and alert before service impact.
Related Errors & Cross-Refs
Compare with expired certificate chain and OCSP connectivity issues.
Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.
View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Chrony manuals, NTP best practices, and Ubuntu timekeeping docs.
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