https://sslnudge.com SSL/TLS certificate monitoring — guides, updates and tips. en https://sslnudge.com/blog/how-to-renew-an-ssl-certificate https://sslnudge.com/blog/how-to-renew-an-ssl-certificate Fri, 05 Jun 2026 00:00:00 GMT How to renew an SSL/TLS certificate with Let's Encrypt, certbot, Nginx, Apache, AWS ACM, and Windows IIS — plus how long renewal takes, how often to do it, and how to automate it so it never lapses. https://sslnudge.com/blog/ssl-vs-tls-difference https://sslnudge.com/blog/ssl-vs-tls-difference Thu, 04 Jun 2026 00:00:00 GMT SSL and TLS explained: what each protocol is, the version history from SSL 2.0 to TLS 1.3, the real differences, and why the certificates are still called 'SSL certificates' even though everything uses TLS today. https://sslnudge.com/blog/check-ssl-certificate-with-openssl https://sslnudge.com/blog/check-ssl-certificate-with-openssl Wed, 03 Jun 2026 00:00:00 GMT A practical OpenSSL command reference for SSL/TLS certificates: check a live site, read a .pem or .crt file, decode a CSR, verify the chain, match a key to a cert, list SANs and expiry, and convert formats. https://sslnudge.com/blog/ssl-handshake-failed-causes-and-fixes https://sslnudge.com/blog/ssl-handshake-failed-causes-and-fixes Tue, 02 Jun 2026 00:00:00 GMT The TLS/SSL handshake fails for a handful of predictable reasons — a protocol or cipher mismatch, an expired or untrusted certificate, an SNI problem, clock skew, or a missing intermediate. Here is how to diagnose and fix each one. https://sslnudge.com/blog/self-signed-certificates-explained https://sslnudge.com/blog/self-signed-certificates-explained Mon, 01 Jun 2026 00:00:00 GMT What a self-signed certificate is, how it differs from a CA-issued one, when it is appropriate (and when it is a security risk), how to generate one with OpenSSL, and how to trust it on your own machines. https://sslnudge.com/blog/wildcard-ssl-certificates-explained https://sslnudge.com/blog/wildcard-ssl-certificates-explained Sun, 31 May 2026 00:00:00 GMT What a wildcard SSL certificate covers, the single-level subdomain limitation, how it compares to multi-domain (SAN) certificates, the security trade-offs of one key across many hosts, and how to get one free. https://sslnudge.com/blog/ssl-certificate-not-trusted-fix https://sslnudge.com/blog/ssl-certificate-not-trusted-fix Sat, 30 May 2026 00:00:00 GMT Browsers show 'your connection is not private' when they can't trust a certificate. The cause is usually a missing intermediate, an untrusted or self-signed root, an expired cert, a name mismatch, or a wrong system clock. Here is how to find and fix each. https://sslnudge.com/blog/ssl-certificate-validity-period https://sslnudge.com/blog/ssl-certificate-validity-period Fri, 29 May 2026 00:00:00 GMT Public SSL/TLS certificates max out at 398 days today, and the CA/Browser Forum has voted to cut that to 47 days by 2029. Here is the current limit, the timeline ahead, why lifespans keep shrinking, and what it means for you. https://sslnudge.com/blog/how-to-get-alerted-before-ssl-certificate-expires https://sslnudge.com/blog/how-to-get-alerted-before-ssl-certificate-expires Thu, 28 May 2026 00:00:00 GMT Stop finding out about expired certificates from your users. Here are five ways to get alerted before an SSL/TLS certificate expires — from cron + openssl to automated monitoring. https://sslnudge.com/blog/how-to-check-ssl-certificate-expiration-date https://sslnudge.com/blog/how-to-check-ssl-certificate-expiration-date Tue, 26 May 2026 00:00:00 GMT Check any SSL certificate’s expiry date using openssl, your browser, curl, an online checker, or automated monitoring. Copy-paste commands for every method. https://sslnudge.com/blog/ssl-certificate-expired-meaning-and-fix https://sslnudge.com/blog/ssl-certificate-expired-meaning-and-fix Fri, 22 May 2026 00:00:00 GMT What an expired SSL certificate actually means, why browsers block the site, how to fix it fast, and how to make sure it never happens again. https://sslnudge.com/blog/monitor-internal-and-private-ssl-certificates https://sslnudge.com/blog/monitor-internal-and-private-ssl-certificates Mon, 18 May 2026 00:00:00 GMT Internal services, private PKI and mutual TLS certificates expire too — and they’re easy to forget. Here’s how to keep track of certificates that aren’t exposed to the public internet. https://sslnudge.com/blog/ssl-certificate-chain-explained https://sslnudge.com/blog/ssl-certificate-chain-explained Thu, 14 May 2026 00:00:00 GMT Leaf, intermediate and root certificates, how the chain of trust works, and how to debug the “unable to verify the first certificate” errors caused by a missing intermediate. https://sslnudge.com/blog/ssl-certificate-monitoring-complete-guide https://sslnudge.com/blog/ssl-certificate-monitoring-complete-guide Sun, 10 May 2026 00:00:00 GMT Why certificate monitoring matters, what to actually check beyond the expiry date, how often to check, and how to set up alerts that reach the right people in time.