Fail2ban
fail2ban protects Linux services from repeated authentication abuse.
Why it matters
- Detects repeated failed login patterns from log streams.
- Applies temporary bans through firewall backends.
- Reduces exposure of SSH and other internet-facing services.
Best-practice usage
- Start with SSH protection and tune ban windows.
- Use explicit allowlists for trusted management networks.
- Monitor false positives and tune jail filters over time.