Latest insights, best practices, and updates from the world of web security.
A complete guide to setting up SSL on a WordPress site — from getting your certificate to fixing mixed content warnings, updating the database,...
Multi-domain SSL certificates (SAN certs) let you secure multiple domains and subdomains with a single certificate. Learn how SANs work, when to...
OCSP Stapling speeds up SSL handshakes and protects user privacy by letting your server deliver certificate revocation status directly. Learn how...
DNS CAA (Certification Authority Authorization) records let you specify which Certificate Authorities are allowed to issue SSL certificates for...
Learn how to set up SSL on Cloudflare correctly. Understand the difference between Flexible, Full, and Full Strict SSL modes, and which one you...
Learn what self-signed SSL certificates are, how to create one with OpenSSL, when they're appropriate for internal use, and why they're never...
Learn how to test your mail server's SSL/TLS configuration for SMTP, IMAP, and POP3. Includes OpenSSL commands, port reference, and common mail...
The SSL certificate name mismatch error means your cert doesn't cover the domain being accessed. Learn the exact causes and how to fix it —...
HTTP Strict Transport Security (HSTS) forces browsers to always use HTTPS for your domain. Learn what it does, how to enable it on Apache and...
Force HTTPS on your website with the correct 301 redirect configuration for Apache .htaccess, Nginx server blocks, cPanel, and WordPress — without...
Step-by-step guide to renewing your SSL certificate on Apache, Nginx, cPanel, and with Let's Encrypt. Avoid site downtime and browser warnings.
Step-by-step guide to installing an SSL certificate on Apache, Nginx, and cPanel. Covers certificate files, real server commands, HTTPS redirect,...
You installed an SSL certificate but Chrome still shows 'Not Secure'. The most common causes are: HTTP pages not redirecting to HTTPS, mixed...
Domain Validation (DV), Organization Validation (OV), and Extended Validation (EV) certificates all encrypt traffic equally, but differ in...
Step-by-step guide to finding and fixing SSL vulnerabilities — weak ciphers, deprecated TLS versions, BEAST, POODLE, HEARTBLEED, missing HSTS....
Complete beginner's guide to migrating your website from HTTP to HTTPS. Covers SSL certificate setup, 301 redirects, mixed content fixes, Google...
In 2026, an SSL certificate affects your Google rankings, browser trust signals, Core Web Vitals, and legal compliance. This guide covers exactly...
Installed an SSL certificate and getting a private key mismatch error? Use OpenSSL to compare modulus values and confirm your private key matches...
ECC (Elliptic Curve Cryptography) certificates offer equivalent security to RSA with much smaller key sizes — a 256-bit ECC key equals a 3072-bit...
Mixed content happens when an HTTPS page loads resources over HTTP — images, scripts, stylesheets, or iframes. This guide shows you how to find...
Let's Encrypt offers free, auto-renewing DV certificates trusted by all browsers. Paid certificates add OV/EV validation, longer validity,...
Every SSL certificate contains dozens of fields: version, serial number, algorithm, issuer, validity, subject, public key, key usage, SANs, and...
HTTPS has been a confirmed Google ranking signal since 2014. In 2026 it affects Core Web Vitals scores, referral data, user signals, and crawl...
An expired SSL certificate causes NET::ERR_CERT_DATE_INVALID and blocks all visitors. This guide covers how to check expiry, identify why...
SSL/TLS handshakes add latency on mobile networks. But HTTPS enables HTTP/2, which more than compensates with multiplexed connections and header...
PEM and PFX/PKCS#12 are the two main SSL certificate container formats. Apache and Nginx use PEM; IIS and Azure use PFX. This guide shows how to...
The SSL handshake failed error can mean expired certs, protocol mismatch, cipher mismatch, or clock skew. This guide diagnoses each cause with...
PCI DSS 4.0 (effective March 2025) mandates TLS 1.2 minimum for all cardholder data environments. This guide covers Requirement 6.4.1 and related...
NET::ERR_CERT_AUTHORITY_INVALID means the browser doesn't trust the certificate authority that issued your SSL certificate. This guide explains...
Certificate Transparency (CT) is a public log system that records every issued SSL certificate. Since 2018, Chrome requires CT compliance for all...
Detailed comparison of free SSL certificates (Let's Encrypt) vs paid certificates (DV, OV, EV). Learn which type is right for your site, what the...
Step-by-step guide to fixing the 'Your Connection is Not Private' error in Chrome, Firefox, Edge, and Safari. Covers NET::ERR_CERT_DATE_INVALID,...
TLS 1.0 and TLS 1.1 have been disabled by all major browsers since 2020–2021 and violate PCI DSS 4.0. This guide shows how to detect if your...
Wildcard certificates cover all subdomains of one domain (*.yourdomain.com). Multi-domain (SAN) certificates cover multiple different domains....
Need to check SSL certificates across dozens of domains? This guide covers bash scripts, Python automation, OpenSSL batch checking, and online...
The SSL certificate chain connects your site's certificate to a root CA trusted by browsers. A broken or missing intermediate certificate causes...
A CSR (Certificate Signing Request) is a block of encoded text you submit to a Certificate Authority to request an SSL certificate. This guide...
TLS 1.3 is faster and more secure than TLS 1.2. Learn the exact technical differences, how to check which version your server uses, and how to...