What it does
SSHGuard reads system logs, detects recognized attacks and blocks repeated sources through supported firewall backends.
SSHGuard links log ingestion to firewall blocking. Its documentation lists several log sources and firewall backends, with temporary unblocking as a default behavior. That makes it useful for a host exposed to repeated authentication noise. Match the logging and firewall backend to the actual operating system before deployment. Review the unblock policy and any permanent blacklist separately. A working log parser matters as much as the firewall rule because the response depends on the event being recognized.
Strengths
- Several log-source and firewall-backend options
Best for
- Administrators implementing log-driven brute-force defenses
Sources
- SSHGuard (Oct 26, 2026)