TLS/SSL Certificate Consulting

Zwiegnet offers specialized TLS/SSL consulting to help organizations implement strong encryption, maintain compliance, and avoid outages due to expired or misconfigured certificates. We focus on practical, automated solutions that scale from single servers to large distributed environments.

Our services cover the full certificate lifecycle:

• Certificate Selection & Procurement – Guidance on choosing the right type (DV, OV, EV, wildcard, multi-domain) from trusted CAs.
• Let’s Encrypt & ACME Automation – Deployment of Certbot, acme.sh, or custom clients with automated renewal via HTTP-01, DNS-01, or TLS-ALPN challenges.
• Commercial Certificate Management – Installation, renewal tracking, and integration of certificates from DigiCert, Sectigo, GlobalSign, etc.
• Web Server Configuration – Secure setup on Apache, NGINX, HAProxy, lighttpd with strong ciphers, HSTS, OCSP stapling, and TLS 1.3.
• Mail & Application Integration – Certificates for Postfix, Dovecot, Exim, OpenVPN, LDAP, databases, and custom applications.
• Certificate Authority Setup – Private/internal CA using OpenSSL, CFSSL, or HashiCorp Vault for internal workloads.
• Troubleshooting – Diagnosis of handshake failures, chain issues, expired certificates, SNI problems, and mixed-content errors.
• Best-Practice Hardening – Cipher suite selection, protocol enforcement, revocation checking (CRL/OCSP), and compliance with PCI, HIPAA, or GDPR requirements.
• Monitoring & Alerting – Setup of expiry monitoring with Prometheus, Nagios, or simple cron-based notifications.
• Migration & Consolidation – Transition from self-signed to trusted certificates, or centralization across multiple servers.

We emphasize automation to eliminate manual renewal errors and ensure continuous, uninterrupted encryption.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct, hands-on expertise with real-world certificate deployments on Linux and Unix systems.