# Fail2ban

> Fail2Ban intrusion prevention system reference. Covers jail configuration, custom regex filters, testing with fail2ban-regex, progressive banning, SSH/Nginx/WordPress protection, ban/unban management, monitoring, and troubleshooting.

- Skill: `bytesagain/fail2ban` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add bytesagain/fail2ban`
- Raw SKILL.md: https://api.skillmd.com/api/skills/bytesagain/fail2ban/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: bytesagain (https://skillmd.com/u/bytesagain)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/bytesagain/fail2ban

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# Fail2Ban Reference

Log-based intrusion prevention system.

## Commands

| Command | Description |
|---------|-------------|
| `intro` | Overview, concepts |
| `config` | Jails, actions, progressive |
| `filters` | Custom filters, testing |
| `management` | Status, monitoring, debug |