🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: FreeBSD 13

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

Clock drift on FreeBSD 13 can break TLS, pkg operations, and automated build pipelines.

Environment & Reproduction

Certificate validation fails, cron jobs misfire, and logs show significant time offset warnings.

Root Cause Analysis

NTP service disabled, blocked UDP 123 traffic, or invalid upstream peers usually drives persistent drift.

Quick Triage

Check service ntpd onestatus, run ntpq -pn, and compare date -u with a trusted reference host.

Step-by-Step Diagnosis

Capture offset and peer reachability before changing daemon settings. image_ref=0

Illustrative mockup for freebsd-13 — terminal_or_shell
Comparing system clock and NTP sources — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Enable and configure ntpd using sysrc ntpd_enable=”YES”, set ntpd_sync_on_start, then service ntpd restart. image_ref=1

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Illustrative mockup for freebsd-13 — log_or_config
Reviewing ntpd.conf and service logs for sync health — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Use service ntpd start|restart and ensure startup flags include safe initial sync behavior on boot.

Verification & Acceptance Criteria

Set reliable pools in /etc/ntp.conf and avoid mixed local clock directives unless intentionally isolated.

Rollback Plan

Allow outbound and reply UDP 123 in pf and verify upstream NTP servers are reachable.

Prevention & Hardening

Confirm offsets stabilize near zero in ntpq -pn and verify TLS-dependent operations succeed.

Alert on offset thresholds and include NTP peer health in regular observability checks.

Related tutorial: View the step-by-step tutorial for freebsd-13.

View all freebsd-13 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

See man ntpd, man ntpq, and the FreeBSD time synchronization documentation.

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