You go to check your website — or worse, a customer tells you — and instead of your homepage, there's a big red warning screen. "Your connection is not private." "This site is not secure." "NET::ERR_CERT_EXPIRED." Whatever version of it they're seeing, the message is the same: your website has an SSL certificate error, and visitors are being warned away before they ever see your content.
That's a serious problem. Most people will hit the back button the moment they see a security warning. They're not going to click through anyway. They'll go to a competitor instead, and you'll never know they came and left. If you run an online store or collect any kind of customer information, the damage can happen fast — lost sales, lost trust, and a growing sense that something's really wrong under the hood.
The good news is that SSL certificate errors are fixable. They're not a sign that your website was built wrong or that you need to start over. But they do need to be addressed promptly, and the fix isn't always as simple as clicking a button. Let's break down what's actually going on.
What Causes a Website SSL Certificate Error
SSL stands for Secure Sockets Layer — it's the technology that creates the encrypted connection between your website and your visitors. You've probably noticed that websites start with "https://" and have a little padlock icon in the browser bar. That's SSL at work. When something goes wrong with it, browsers are designed to alert users loudly, because the failure could expose sensitive information.
There are several common reasons an SSL certificate error appears:
The certificate expired. SSL certificates aren't permanent — they have to be renewed, typically every year or every 90 days depending on the type. If renewal slips through the cracks (and it happens more than you'd think), the certificate becomes invalid and browsers start showing warnings immediately.
The certificate wasn't installed correctly. Even a valid certificate can trigger errors if it wasn't set up properly. This includes missing what's called an "intermediate certificate" — a piece of the security chain that proves your certificate is legitimate. If that's missing, browsers won't trust it.
Your domain doesn't match what the certificate covers. If your certificate was issued for www.yoursite.com but someone visits yoursite.com (without the www), it can cause a mismatch error. Same thing happens if your site recently moved to a new domain without a properly issued certificate for the new address.
Mixed content on the page. Sometimes your main site connection is secure, but certain elements — images, scripts, embedded content — are still being loaded over an unsecured http:// connection. Browsers flag this as a mixed content warning, which can look and behave like a full SSL error.
The certificate was revoked or issued by an untrusted authority. Less common, but it happens. Some certificates are issued by providers that browsers don't recognize as trustworthy.
If your site recently broke after a hosting renewal or some kind of backend change, there's a chance the SSL situation got caught up in that too — worth checking out our article on websites breaking after hosting renewal for more context.
What Fixing a Website SSL Certificate Actually Involves
The fix depends entirely on what's causing the error, which is why you can't always just click "renew" and walk away. Here's a realistic picture of what resolution looks like:
If the certificate is expired, someone needs to renew it through whatever certificate authority issued it — or through your hosting provider, many of whom offer free SSL via Let's Encrypt. After renewal, the new certificate has to be properly installed and activated on the server. That last step is where things can go wrong if you're not familiar with how hosting control panels or server configurations work.
If the issue is an incorrect installation, a technician needs to go into the server settings, identify what's missing or misconfigured, and reissue or reinstall the certificate correctly. This sometimes involves contacting the certificate authority or your hosting support.
For a domain mismatch, the certificate needs to be reissued to cover all the variations of your domain that visitors might type — with and without "www," for example. Modern certificates can cover multiple versions of a domain (these are called SAN or wildcard certificates), but they have to be configured intentionally.
Mixed content errors require a site-wide audit of every page element to identify what's still loading over an insecure connection, then updating those references to use the secure version. On a site with lots of images, embeds, or third-party scripts, this can be more time-consuming than it sounds.
None of this is rocket science for someone who works with websites regularly, but it does require access to your hosting environment, a working knowledge of how SSL certificates are issued and installed, and the ability to verify the fix actually worked across browsers.
Signs This Is Your Issue
Not sure if this is what's happening to your site? Here's what to look for:
- Visitors report seeing a "Not Secure" warning or a red lock icon in their browser
- Your own browser shows a warning page before loading your site
- Your site loads fine for you but not for others (sometimes browsers cache old certificates)
- Your site URL starts with
http://instead ofhttps:// - The padlock icon in the browser bar is broken, crossed out, or missing
- You recently switched hosting providers, renewed a domain, or made backend changes
If customers are actively telling you they're getting security warnings, treat it as urgent. You may already be losing sales right now. If you're also seeing payment issues layered on top of this, it's worth reading about payment processing problems on websites — they're sometimes connected.
Should You Try to Fix It Yourself?
If you're comfortable logging into your hosting control panel and have some experience with website backends, renewing a Let's Encrypt certificate through a host like SiteGround, Kinsta, or WP Engine is often straightforward — many of these hosts have one-click SSL tools.
But if you're not sure where your certificate came from, don't have easy access to your hosting environment, or if you've already tried renewing and the warning is still showing up, it's worth getting help. A partially fixed SSL problem can be just as damaging as an unfixed one — visitors will still see the warning.
It's also worth knowing that diagnosing why the error is happening in the first place is half the battle. If you don't know whether it's an expiration, a misconfiguration, a domain mismatch, or a mixed content issue, you risk spending time on the wrong fix. For business owners who just need the site working again, handing this off is usually the smarter call. We cover the broader question of when to DIY versus when to call someone in our guide on what to do when your website is broken and you don't know why.
If this isn't your first rodeo with site problems, you might also be wondering what professional fixes actually cost — here's an honest breakdown of website repair pricing so you go in with realistic expectations.
Common Questions About Website SSL Certificate Errors
Why does my website say "Not Secure" even though I have an SSL certificate? Having a certificate and having it working correctly are two different things. Your certificate might be expired, installed incorrectly, or not covering the exact version of your URL visitors are using. It's also possible you have mixed content — some elements on the page still loading over an insecure connection even though the main certificate is valid.
Can an SSL certificate error hurt my Google rankings? Yes, it can. Google has used HTTPS as a ranking signal for years, and a site showing security errors signals an untrustworthy connection. Beyond rankings, browsers may actively block visitors from reaching your site, which means lower traffic, higher bounce rates, and fewer conversions — all things that further drag down your visibility over time.
How long does it take to fix an SSL certificate error? For a straightforward renewal or reinstallation, it can often be resolved within a few hours. More complex issues — like a domain mismatch, mixed content across many pages, or a misconfigured server — can take longer to diagnose and fix properly. The bigger delay is usually in identifying the root cause rather than the fix itself.
Will my visitors lose any data because of an SSL error? An SSL error means the encrypted connection isn't functioning as it should, which can potentially expose data sent through the site — like form submissions or payment information. Whether data was actually intercepted depends on whether someone was actively exploiting the gap, which is rare, but it's a real risk. This is why these errors shouldn't be ignored or dismissed as cosmetic.
My SSL certificate was just renewed — why is the error still showing? Renewal alone doesn't always fix the problem. After a certificate is renewed, it has to be properly installed and activated on your server. Some hosting platforms do this automatically; others require manual steps. It's also possible there's a secondary issue — like a mixed content problem or domain mismatch — that the renewal didn't address. If the warning is still there after renewal, the installation itself is worth checking.
The Faster Path
SSL certificate errors are one of those problems that feel invisible until they're very visible — usually because a customer mentioned it, or because you happened to visit your own site from a different device or browser. By that point, you've already lost some traffic and possibly some sales.
Rune is a flat-rate website repair service built for exactly this situation. You're not a developer, you don't want to become one, and you just need someone to get in there, find the problem, and fix it properly — without a vague hourly estimate or a week-long wait. SSL issues are squarely in our wheelhouse.
If your site is showing a security warning, runeintel.com is the starting point. Tell us what you're seeing, and we'll take it from there.