Articles & Guides

SSL monitoring for SaaS: how to never miss a certificate expiry, monitor wildcard and API domains, and avoid a product-wide outage. A practical 2026 guide.

Compare the best SSL certificate monitoring services of 2026: enterno.io, UptimeRobot, Pingdom and more. Expiry alerts, check frequency and pricing.

The best SSL checker tools of 2026 compared: SSL Labs, enterno.io, DigiCert and more. Compare depth of analysis, speed, monitoring and price.

Weak cipher suites (RC4, 3DES, MD5, EXPORT) drop SSL Labs grade to B or F. Learn how to detect them, disable in nginx, and pick a safe set.

HSTS and preload list — how to force browsers to always use HTTPS. Strict-Transport-Security setup, hstspreload.org submission, gotchas.

How to get a free Let's Encrypt SSL certificate: certbot setup for nginx and Apache, wildcard certificates via DNS-01, automatic renewal every 90 days, alternative ACME clients, and common issuance errors. Step-by-step commands for Ubuntu, Debian, and CentOS.

TLS 1.3 vs TLS 1.2 — detailed comparison: speed, security, compatibility. Step-by-step nginx migration guide with backward compatibility notes.

How an SSL certificate chain works: leaf, intermediate and root certs, trust stores and path building, plus verification commands and incomplete-chain fixes.

Wildcard vs SAN certificates — differences, pricing, security, automation. Which cert type to pick for different architectures and how many domains to cover.

Self-signed SSL certificates: when they're appropriate, how to create them with openssl, trust them system-wide, and when to use Let's Encrypt or internal PKI instead.