Stunnel Consulting

Zwiegnet provides specialized stunnel expertise — the universal TLS/SSL tunneling tool that adds encryption to any TCP-based service without modifying the application. Ideal for securing legacy systems, databases, email, remote management, and custom protocols on Linux, Solaris, and other Unix platforms.

Our stunnel services include:

• Basic TLS Wrapping – Encrypting clear-text services (IMAP/POP3, LDAP, MySQL, PostgreSQL, Redis, Syslog, custom apps) with client/server stunnel configurations.
• Certificate Management – Integration with Let’s Encrypt/ACME, commercial CAs, or self-signed certs; automated renewal and key rotation.
• Protocol Downgrade & Compatibility – Supporting older TLS versions, cipher suites, or STARTTLS emulation for legacy clients.
• High Availability & Load Balancing – Multi-instance stunnel setups, integration with HAProxy/NGINX, or keepalived failover for uninterrupted encrypted access.
• Performance Optimization – Session caching, forking vs. libwrap, connection limits, and tuning for high-throughput encrypted traffic.
• Remote Access Tunnels – Secure RDP, VNC, or administrative ports over stunnel for encrypted remote management.
• Database Encryption – TLS wrapping for Oracle, MySQL, PostgreSQL, or MongoDB connections in compliance-sensitive environments.
• Integration with Other Services – Combining stunnel with Postfix, Dovecot, Apache, NGINX, or LDAP for end-to-end encryption.
• Security Hardening – Chroot, privilege drop, strict verification modes (verify=3/4), OCSP stapling, and protection against common attacks.
• Troubleshooting & Debugging – Detailed logging analysis, handshake failure diagnosis, certificate chain issues, and protocol mismatches.

Stunnel is the lightweight, reliable way to add strong encryption where native TLS support is missing — we ensure your tunnels are secure, performant, and highly available.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct access to experienced stunnel specialists with production deployments across diverse applications.