FreeBSD 14 – PF Rules Not Applied After Reload – Anchor and Syntax Recovery

📖 ~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

Firewall policy is not enforced, exposing services or blocking required traffic.

Environment & Reproduction

Occurs after editing pf.conf or anchor files without validation.

service pf status
pfctl -sr

Root Cause Analysis

Syntax errors or missing anchor includes prevent PF from loading target rules.

Quick Triage

Run syntax check and inspect last error line before reloading firewall.

pfctl -nf /etc/pf.conf

Step-by-Step Diagnosis

Validate anchor path references and macro expansion for the active ruleset.

grep -n 'anchor|load anchor' /etc/pf.conf
ls -lah /etc/pf.anchors

Solution – Primary Fix

Correct syntax/anchor references and reload PF with a validated config.

pfctl -nf /etc/pf.conf
pfctl -f /etc/pf.conf
service pf restart

Solution – Alternative Approaches

Generate PF rules from template automation to reduce manual syntax mistakes.

Verification & Acceptance Criteria

Expected rules and states are visible and traffic policy behaves correctly.

pfctl -sr
pfctl -ss | head

Rollback Plan

Reapply last known-good pf.conf snapshot and reload firewall.

Prevention & Hardening

Enforce pre-commit syntax tests and staged firewall rollout checks.

Related Errors & Cross-Refs

pfctl: Syntax error in config file, DIOCSTARTALTQ: Device not configured.

Related tutorial: View the step-by-step tutorial for freebsd-14.

View all freebsd-14 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

PF user guide, FreeBSD firewall and anchor management references.