fail2ban Consulting & Hardening

fail2ban is a critical defense against brute-force attacks on Linux servers. Zwiegnet provides expert configuration, tuning, and hardening of fail2ban to protect SSH, web services (Apache/NGINX), email (Postfix/Dovecot), and custom applications with intelligent, dynamic banning.

Our fail2ban services include:

• Custom Jail Design & Filters – Create tailored jails for SSH, Apache, NGINX, Postfix, Dovecot, WordPress, and custom services; advanced regex filters for precise attack detection.
• Action Hardening & Integration – Use firewalld, iptables, nftables, or ipset for banning; custom actions (email alerts, Slack/Discord notifications), and persistent bans.
• Rate Limiting & Ban Policies – Fine-tune findtime, maxretry, bantime, and ignoreip lists to minimize false positives while blocking threats effectively.
• Security Hardening – Protect fail2ban itself (secure log paths, restricted access), prevent ban evasion, and comply with PCI-DSS, HIPAA, NIST standards.
• High Availability & Clustering – Synchronize bans across multiple servers with Redis or database backends for clustered environments.
• Monitoring & Logging – Integrate fail2ban logs with auditd, rsyslog, Prometheus, or SIEM; real-time alerts for ban events and failed logins.
• Migration & Modernization – Upgrade legacy fail2ban to current versions, migrate from iptables to nftables/firewalld, and integrate with modern security stacks.
• Troubleshooting & Recovery – Diagnose false bans, filter failures, ban loop issues, and rapid recovery from misconfiguration.

Ideal for: enterprises, financial institutions, healthcare providers, e-commerce, SaaS platforms, and any organization needing robust brute-force protection on Linux servers.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct access to fail2ban specialists with proven experience in secure Linux environments.