Fix WordPress SSL and "Not Secure" Errors

A "Not Secure" warning in the browser bar is one of the fastest ways to lose a visitor's trust, and it's more common than it should be — usually from something small rather than a serious security breach. Here's what's actually going on and how to fix it.

What SSL Actually Does

An SSL certificate encrypts the data moving between your site and a visitor's browser — form submissions, login details, payment information — so it can't be intercepted in transit. It's what turns "http://" into "https://" and shows the padlock icon. It doesn't prevent your site from being hacked on its own, but it's a baseline expectation from both visitors and search engines at this point.

Why Your Site Shows "Not Secure"

This almost always comes down to one of a few things: your SSL certificate expired and wasn't renewed, the certificate doesn't cover the exact domain variant being requested (like www vs. non-www), or — the most common cause by far — the page is loading some content insecurely even though the certificate itself is fine.

Mixed Content: The Usual Culprit

A "mixed content" warning means your page loads over https:// but still pulls in an image, script, or stylesheet over the old http:// address, usually because that URL was hardcoded into a post, a theme setting, or a widget years before the site had SSL at all. Browsers flag this because an unencrypted resource on an otherwise secure page is a real, if smaller, security gap.

Fixing an Expired or Missing Certificate

Most managed WordPress hosts now issue and renew free SSL certificates automatically through Let's Encrypt, so an expired certificate on a modern host usually means an auto-renewal failed silently rather than something you forgot to do. Checking your host's SSL settings page and manually reissuing the certificate is usually a one-click fix.

Finding and Fixing Mixed Content

A free scanning tool like WhyNoPadlock will point to the exact insecure resources on a given page. From there, a plugin like Really Simple SSL can automatically rewrite hardcoded http:// URLs across your database to https://, which handles the majority of cases without manually editing every post.

Does SSL Actually Affect SEO?

Yes, though modestly on its own — Google has confirmed HTTPS as a ranking signal since 2014, and a "Not Secure" warning can indirectly hurt rankings further by increasing bounce rate, since visitors leave rather than proceed. It's foundational rather than a major ranking lever by itself, but it's not optional at this point.

Common Questions