🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: FreeBSD 15

📖 ~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

Multiple users are unexpectedly denied login, impacting normal operations and support workflows.

Environment & Reproduction

Common after policy changes in login.conf, PAM, or directory-synced accounts.

pw lockstat
loginctl || true
grep -R password /etc/pam.d

Root Cause Analysis

Conflicting password/lockout thresholds enforce stricter behavior than intended.

Quick Triage

Identify affected users and the active policy class.

pw usershow admin
cap_mkdb /etc/login.conf
last | head

Step-by-Step Diagnosis

Trace authentication path through PAM and login class definitions.

grep -n default /etc/login.conf
authctl test || true
tail -n 100 /var/log/auth.log
Illustrative mockup for freebsd-15 — terminal_or_shell
Reviewing login class and policy settings — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Normalize policy values, rebuild capability database, and unlock accounts.

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vipw
cap_mkdb /etc/login.conf
pw unlock admin
Illustrative mockup for freebsd-15 — log_or_config
Resetting lockout state and policy consistency — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Adopt centralized identity policy with staged rollout and explicit exception classes.

Verification & Acceptance Criteria

Users authenticate normally under approved password and lockout policy.

su - admin
ssh admin@localhost true

Rollback Plan

Restore previous login.conf and PAM backups if new policy causes regressions.

cp /etc/login.conf.rollback /etc/login.conf
cap_mkdb /etc/login.conf

Prevention & Hardening

Review policy changes in change control and test against representative accounts first.

Often linked to sudo failures and SSH authentication confusion after lockouts.

Related tutorial: View the step-by-step tutorial for freebsd-15.

View all freebsd-15 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

login.conf(5), pam(8), and FreeBSD account policy documentation.

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