GuardSSL Blog

Master cipher suite configuration for Nginx, Apache, and Cloud platforms. Learn which cipher suites to enable, which to disable, and how to achieve an A+ SSL rating in 2026.

Compare the best free SSL certificate monitoring tools in 2026. We tested GuardSSL, Certbot, SSL Labs, and more to help you choose the right solution for your needs.

Your SSL certificate just expired? Don't panic. Follow these 5 emergency steps to restore HTTPS and minimize downtime. Complete guide with commands and prevention tips.

Confused about SSL vs TLS? Learn the key differences, why SSL is obsolete, and how TLS protocols protect your website in 2026. Complete technical guide.

Think Let's Encrypt auto-renewal means you're safe? Think again. Learn why 23% of Let's Encrypt renewals fail and how SSL monitoring prevents costly downtime.

Encountering SSL errors? This comprehensive guide covers the most common SSL certificate errors and provides step-by-step solutions.

Learn what the Extended Key Usage field in SSL certificates means, common EKU values, and why they matter for security.

Getting mixed content warnings after enabling SSL? Learn how to find and fix HTTP resources on your HTTPS site.

Learn multiple ways to check your SSL certificate expiration date and set up monitoring to avoid unexpected outages.

A complete guide to creating Discord webhooks and connecting them to GuardSSL for automated SSL expiration notifications in your server.

A complete guide to creating a custom bot in Feishu/Lark and connecting it to GuardSSL for SSL certificate expiration alerts.

A complete step-by-step guide to creating Slack Incoming Webhooks and integrating them with GuardSSL for real-time SSL certificate expiration alerts.

Learn how to create a Telegram bot, get your Bot Token and Chat ID, and connect it to GuardSSL for instant SSL certificate expiration alerts.

New to SSL? This beginner-friendly guide explains what SSL/TLS is, how it works, and why every website needs it.

Understand how SSL certificate chains work, why intermediate certificates matter, and how to fix chain-related errors.

Learn what certificate fingerprints are, how they're generated, and the difference between SHA-1 and SHA-256 fingerprints.

Confused about SSL certificate types? Learn the differences between Domain Validation, Organization Validation, and Extended Validation certificates.

Understand why SSL certificates expire, what happens when they do, and how to prevent certificate-related outages.

A beginner-friendly guide to understanding SSL cipher suites, what the Cipher field means in your SSL check results, and how to choose secure options.

A plain-English guide to understanding key strength in SSL certificates, what the 'bits' field means, and how different key sizes affect security.

Understand what the serial number in SSL certificates means, how it's generated, and its crucial role in certificate revocation.

Ever wondered what happens in those milliseconds when you connect to a secure website? Learn how the TLS handshake establishes encrypted connections.

Learn what Certificate Authorities are, why they matter, and how to recognize if your SSL certificate comes from a trusted source.

A clear explanation of OCSP, how it works, what OCSP Stapling is, and why it matters for website performance and security.

A clear explanation of the TLS protocol, why your website needs it, and the key differences between TLS 1.2 and TLS 1.3.