Types of SSL Certificate Errors: Why do they occur & how to fix them?

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The Common SSL Certificate Errors and How to Fix Them

An SSL certificate is the standard security measure with which businesses are providing security to their website today.

If you own a business website, probably you have installed an SSL too. It not only encrypts the sensitive information in your site but also helps in gaining visitors’ trust, enhancing customer experience, boosting SEO, and increasing sales, among others.

But have you ever come across SSL cert errors while trying to browse a web page? They are very common.

An SSL certificate error will occur if your web browser isn’t able to authenticate the SSL certificate that you have installed on your site. It displays an error message with a warning, as shown in the snapshot below.

In this article, we are going to reveal several SSL errors that you are likely to encounter and tell you why they occur and how you can fix them. Knowing how to fix SSL errors will help you have a seamless web browsing experience.

Types of SSL errors and how to fix them

Error 1 : SSL Certificate Not Trusted

If you see this error, it indicates that the browser does not trust the SSL certificate issuer. It is most likely that the Certificate Authority is not among those trusted certificate providers who are on the browser’s built-in list. There is also a chance that the cert is self-signed.


  • Upgrade your SSL. Ensure that you are obtaining your digital cert from a trusted authority. For instance, if you avail your SSL from GeoTrust, a CA trusted by many and recognized by almost all browsers, you won’t encounterSSL Certificate Not Trusted error. Powered by DigiCert, the GeoTrust SSL not only ensures security but is known to offer a seamless experience for SSL users.
  • Try creating a new CSR from your server in case your SSL has been incorrectly installed. You can ask your CA to reissue it. It might resolve the issue.

Error 2 : Name Mismatch

Different browsers will display different warning signs. But Name Mismatch Error is a common error. The error is caused if the website SSL domain name (or SAN) fails to match the website address, which the user enters into the address bar.

It indicates that the security certificate of the website was issued to a different domain rather than the one accessed by the user.

This issue may even arise because your web host has pre-configured SSL settings.


  • Enter your site’s domain into the SSL checker. In case you don’t find the website add in the SAN, click on the Ignore certificate mismatch. You will notice a full analysis. Check whether the correct domains and IP addresses have been included.
  • If your website has pre-configured SSL settings, click on the Ignore certificate mismatch. The SAN might still have the name of your web host. In that case, contact your host and ask them to remove their SSL and set up yours.


If you use Chrome, you must have encountered an ERR_CERTIFICATE_TRANSPARENCY_REQUIRED error. It usually occurs when you install an SSL certificate that has not been added to the certificate transparency logs by the CA.


  • If you are a website owner, contact your CA and ask them to add your website to the Certificate Transparency log. It will solve the issue.

If you are not the web owner, make sure to follow these steps:

  • Try disabling your anti-virus software and Firewalls before you visit the website.
  • Upgrade to the latest version of Google Chrome.
  • Clear the SSL State to fix ERR_CERTIFICATE_TRANSPARENCY_REQUIRED error. For Windows users, visit Internet Properties and find the Content tab. Select Clear SSL State option, click Apply, and tap on OK.

Error 4 : Mixed Content

Mix Content occurs when a page secured by SSL contains an element loaded from a page that is not secured by SSL. The element from the unsecured page can be an image, video, scripts, flash animation, or a snippet.

Modern browsers may attempt to block this content or display warnings.


  • For Chrome users, Google’s Upgrade Insecure Requests can treat the HTTP request as HTTPS and fix the error. In case you are not the website owner, request the owners to add the code shown below:
  • If you are using Firefox version 23, the browser will automatically block mixed content. Website owners must provide all the content over HTTPS. They need to change them in the HTML source code.
  • Open the insecure page from where you are getting the unsecured images, videos, or scripts and look for Http://. You can alter the references to HTTPS. Note that this command will not work in case the images you are loading are from a different website that has not implemented SSL.
  • Try altering the code of the page that shows the warning. In case you are not the owner of the web, browse tools and go to Internet Options. Under the Security tab, tap on Custom Level. After that, scroll down until you find Display mixed content. Select Enable, and click ‘’ A Security Warning will pop-up. Tap Yes.


Also you may like to know some Advantages And Disadvantages Of HTTPS To Secure Website


Error 5 : Expired SSL Certificate

The lifespan of an SSL certificate is 27 months maximum as per the regulations set by the Certificate Authority/Browser (CAB) Forum. If the site’s SSL certificate expires, you will see this error.


Renew your SSL certificate immediately.To do that, create a CSR from your web host, activate your SSL cert, and install it. You will have to do this at least once after two years.

Error 6 : Invalid Server Certificate

If you see this error, Google Chrome is unable to locate a valid server certificate in order to begin the secured communication. A valid server cert is required to begin an encrypted session. And the cert should be from a trusted SSL Certificate authority.


  • Ensure that the website is not blocked by a Firewall or by Anti-virus. Sometimes, websites can be blocked by your Firewall or Anti-virus. Unblock it and see if it works.
  • Clean browsing history, cache, and cookies.
  • Ensure that the date and time are set correctly and matches the current time zone.
  • Using an SSL checker tool, verify if your SSL is installed correctly.
  • Ensure that the cert is issued by a trusted and genuine CA so that it is recognized by the browser.


An SSL certificate is crucial if you own a business website. It can secure the sensitive information that you store on your site. But at times, it can cause irritating errors, and you will be stuck if you don’t know how to fix them.

The SSL errors mentioned above are the most common SSL errors that web owners encounter. Hopefully, this article will help you to resolve the issues you are facing or may possibly face in the future.

Ensure that you are availing your digital cert from a trusted CA. Only then, the browser you are using will identify it, and you will have fewer chances of encountering issues.

Moreover, visitors only trust reputed CAs. Thus, you will be gaining their trust by going for a reputed CA. Consider obtaining your cert from geotrustssl, which is a leading CA, trusted by many.

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