SSH Consulting & Hardening

SSH is the backbone of secure remote administration on Linux, but default configurations are vulnerable to brute-force attacks and credential theft. Zwiegnet delivers hardened, scalable, and compliant SSH setups for enterprises, financial institutions, healthcare, and any organization requiring bulletproof remote access.

Our SSH services include:

• Secure SSH Server Configuration – Disable password auth, root login, legacy protocols; enforce strong ciphers, key exchange, and MACs.
• Key-Based Authentication & Management – Deploy ed25519/ssh-rsa keys, automated key rotation, ssh-agent forwarding control, and centralized key distribution.
• Multi-Factor Authentication (MFA) – Integrate Google Authenticator, YubiKey, Duo, or TOTP for two-factor SSH login.
• Certificate-Based Authentication – Use SSH certificates with CA signing, short-lived keys, and integration with internal PKI for scalable, auditable access.
• Port Knocking & Rate Limiting – Implement port knocking (knockd), fail2ban, or iptables/nftables rate limiting to block brute-force attacks.
• Auditing & Logging – Enable verbose logging, auditd integration, centralized syslog, and real-time monitoring for suspicious activity.
• High Availability & Bastion Hosts – Design jump/bastion hosts, SSH multiplexing, and HA configurations with keepalived or load balancers.
• Migration & Modernization – Transition from legacy SSH (OpenSSH 7.x → 9.x), migrate keys/certificates, and integrate with modern IAM (LDAP/Kerberos/RADIUS).

Ideal for: enterprises, financial institutions, healthcare providers, SaaS platforms, and any organization requiring secure, auditable, and scalable SSH access on Linux.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct access to SSH security specialists with proven experience in enterprise remote access hardening.