π ~1 min read
Table of contents
Symptom & Impact
Clock drift causes authentication, TLS, and scheduling failures.
Environment & Reproduction
Observed after firewall changes or unreachable upstream NTP.
timedatectl statusRoot Cause Analysis
systemd-timesyncd cannot reach configured NTP servers or receives invalid responses.
Quick Triage
Check synchronization status and service health.
timedatectl timesync-status && systemctl status systemd-timesyncdStep-by-Step Diagnosis
Inspect timesyncd logs for server reachability errors.
sudo journalctl -u systemd-timesyncd --since -2h
Solution – Primary Fix
Configure valid NTP servers and restart synchronization service.
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sudo timedatectl set-ntp true && sudo systemctl restart systemd-timesyncd
Solution – Alternative Approaches
Deploy `chrony` when advanced NTP control and tracking are required.
Verification & Acceptance Criteria
`System clock synchronized: yes` appears in `timedatectl status`.
Rollback Plan
Restore previous timesyncd or chrony configuration from backup.
Prevention & Hardening
Use redundant NTP sources and monitor offset with alerts.
Related Errors & Cross-Refs
Related to Kerberos ticket failures and certificate validity window errors.
Related tutorial: View the step-by-step tutorial for Ubuntu 24.04 LTS.
View all Ubuntu 24.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Ubuntu time synchronization and NTP operations references.
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