📖 ~1 min read
Table of contents
Symptom & Impact
Firewall rules disappear after reboot, exposing services or blocking required traffic unexpectedly.
Environment & Reproduction
Occurs when rules are applied interactively but not saved to persistent configuration.
Root Cause Analysis
nftables service loads empty or outdated ruleset because save workflow is incomplete.
Quick Triage
Capture current working ruleset immediately before rebooting affected host.
Step-by-Step Diagnosis
Check nftables service status, startup logs, and configured rules file path.
Solution – Primary Fix
Export active ruleset to /etc/nftables.conf, enable nftables service, and validate boot load.
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Solution – Alternative Approaches
Manage firewall persistence through configuration management templates and controlled deployments.
Verification & Acceptance Criteria
Post-reboot ruleset matches baseline and service accessibility tests pass.
Rollback Plan
Restore previous nftables.conf and reload if new policy causes connectivity regressions.
Prevention & Hardening
Automate periodic ruleset drift checks and backup firewall configurations.
Related Errors & Cross-Refs
nftables service inactive; ruleset empty after reboot; policy drop traffic unexpectedly.
Related tutorial: View the step-by-step tutorial for debian-12.
View all debian-12 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
nftables wiki, Debian nftables package docs, and firewall operations practices.
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