📖 ~1 min read
Table of contents
Symptom & Impact
TLS connections fail, logs have incorrect timestamps, and scheduled jobs run at wrong times due to clock drift.
Environment & Reproduction
Common in virtualized hosts, disconnected networks, or systems migrated across time zones.
Root Cause Analysis
NTP service is disabled, blocked by firewall, or pointed to unreachable servers.
Quick Triage
Run timedatectl and systemctl status systemd-timesyncd to verify synchronization state quickly.
Step-by-Step Diagnosis
Check NTP peers and recent sync attempts with journalctl -u systemd-timesyncd -n 100.
Solution – Primary Fix
Enable service using sudo systemctl enable –now systemd-timesyncd, set valid NTP servers in /etc/systemd/timesyncd.conf, then restart service.
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Solution – Alternative Approaches
Use chrony package for advanced environments requiring multiple peers and stricter drift controls.
Verification & Acceptance Criteria
timedatectl shows ‘System clock synchronized: yes’ and TLS services stop reporting certificate time mismatch.
Rollback Plan
Revert timesyncd configuration changes and disable custom NTP entries if they create instability.
Prevention & Hardening
Use internal NTP sources for servers and monitor time offset in routine health checks.
Related Errors & Cross-Refs
Related errors include apt TLS failures and Kerberos skew issues due to incorrect system time.
Related tutorial: View the step-by-step tutorial for Ubuntu 26.04 LTS.
View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
timedatectl man page, systemd-timesyncd docs, and Ubuntu server time synchronization guidance.
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