π ~1 min read
Table of contents
Symptom & Impact
Users experience auth failures and TLS errors due to time skew.
Environment & Reproduction
Observed on hosts with unstable virtual clock source or blocked NTP traffic.
Root Cause Analysis
System clock drifts beyond acceptable tolerance for secure protocols.
Quick Triage
Compare system time with trusted reference and inspect ntpq status.
Step-by-Step Diagnosis
Validate upstream reachability, offset trends, and clocksource stability.
Solution – Primary Fix
Reconfigure NTP peers, force initial sync, and monitor drift correction.
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Solution – Alternative Approaches
Use authenticated local stratum source when internet NTP is restricted.
Verification & Acceptance Criteria
Offset remains within policy and auth/TLS operations succeed reliably.
Rollback Plan
Revert to previous NTP profile if new peers introduce instability.
Prevention & Hardening
Alert on offset thresholds and enforce redundant time sources.
Related Errors & Cross-Refs
Commonly linked with ticket expiry errors and certificate not-yet-valid messages.
Related tutorial: View the step-by-step tutorial for Ubuntu 14.04 LTS.
View all Ubuntu 14.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Consult Ubuntu NTP operations and secure time synchronization guidance.
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