FreeBSD 13 – ntpd fails to synchronize and system time drifts beyond tolerance

📖 ~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 causes TLS, auth, and distributed workflow failures.

Environment & Reproduction

Follows ACL changes, peer outages, or driftfile corruption.

Root Cause Analysis

Peers are unreachable/rejected and local clock is not corrected.

Quick Triage

Test UDP/123 reachability and ntpd startup flags.

Step-by-Step Diagnosis

Inspect peer states, leap indicator, and path quality to peers.

Solution – Primary Fix

Reset drift state, perform one-shot sync, and restart ntpd.

Solution – Alternative Approaches

Use chrony for faster convergence under variable latency.

Verification & Acceptance Criteria

Offset converges within policy and a stable selected peer exists.

Rollback Plan

Restore prior ntp.conf and restart the previous time daemon.

Prevention & Hardening

Configure multiple upstream peers and monitor jitter/offset continuously.

Related Errors & Cross-Refs

Frequently surfaces as certificate or token validation errors.

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

ntpd docs and FreeBSD time synchronization guidance.