SSL Certificate Errors: Causes & Ways to Prevent and Fix Them

SSL Certificate Errors: Causes & Ways to Prevent and Fix Them

Do you like visiting websites showing your connection is not private? As a part of security, you don’t, right? Well, the reason is mostly an inactive SSL certificate or expired SSL Certificate. This means your browser is unable to verify the authenticity of a website’s SSL Certificate.

We know that having a valid and active SSL Certificate for a website means complete safety. But an inactive or expired SSL is a nightmare. This means an SSL error does the opposite of working SSL certificates.

We shall enlarge on the idea of SSL errors in this article and identify their sources. You may fix these typical SSL problems and regain the security of your website by being aware of them. Integrating a cheap SSL Certificate improves security and offers a useful solution to protect user data.

What are SSL Certificate Errors?

Think of SSL errors as cautionary signs you may bump into when browsing the web. Here’s how a typical SSL error looks like:

These errors are your browser’s clever way of letting you know that the websites you’re trying to access may not be trustworthy. And that your personal information could be at risk if you proceed.

What are SSL Errors?

The following are some of the most typical SSL connection errors you could experience:

Each type of SSL Certificate error points to a different problem. This means that when you go through such a problem, your website browser will show a specific message that provides you with information about why you saw that error.

Common SSL Certificate Errors

Some SSL errors can be disturbing for internet users. Thankfully, these errors hint at what exactly is wrong with your SSL certificate.

For webmasters, understanding these errors is crucial for maintaining a secure website. Here are some of the most common SSL errors you will want to be knowledgeable about;

  • SSL Certificate Not Trusted ErrorSSL Certificate Not Trusted Error

    Most modern browsers for example, Google Chrome may trigger the NET::ERR_CERT_AUTHORITY_INVALID error when the SSL certificate installed on your website wasn’t issued by a trusted Certificate Authority (CA). CAs, do the verification of domain ownership and then issue digital certificates that contain cryptographic keys. Few other possible reasons for your website throwing the NET::ERR_CERT_AUTHORITY_INVALID error are incorrect date and time settings on the system or if you’re using a self-signed SSL certificate.

  • Name Mismatch Error

    Name Mismatch Error
    Much like other browser errors, the NET::ERR_CERT_COMMON_NAME_INVALID error is primarily caused by improper SSL certificate installation on your server. It may result from the SSL certificate not being set up correctly, thus leading to the invalid common name.

    This error may also be triggered if you switch protocol from insecure HTTP to secure HTTPS before installing a valid SSL certificate. Another possible explanation for the NET::ERR_CERT_COMMON_NAME_INVALID error is forceful redirects. When you incorrectly configure your site to redirect visitors to HTTPS from insecure HTTP, they may encounter this error.

  • Mixed Content Error

    Mixed Content Error
    Mixed content error is another fairly common SSL error encountered on HTTPS websites. It arises when some elements on your website, for example, scripts, images, videos, spreadsheets, are still served over the HTTP protocol instead of the secure HTTPS. This protocol mismatch can compromise the safety and security of the content as it loads over an unsecured connection.

  • Expired SSL Certificate Error

    Expired SSL Certificate Error
    The NET::ERR_CERT_DATE_INVALID may be triggered on your visitors’ browsers. This happens if the SSL certificate on your website has passed its expiration date or its validity period is not yet in effect. SSL Certificate Expiration error also happens if the date and time configuration on the device is incorrect. Other issues like cached data or their devices being infected by malware can also contribute.

  • SSL Certificate Revoked Error

    The NET::ERR_CERT_REVOKED shows that the SSL certificate that is associated with or installed on your website has been revoked. This error can be a result of several issues, including the expiration of your SSL certificate, security concerns, incorrect insurance, or just the common glitches common with self-signed certificates.

  • Generic SSL Protocol Error

    The ERR_SSL_PROTOCOL_ERROR error can occur due to a number of factors on the user end. These usually range from problematic Chrome extensions to using outdated browser versions etc.

    Generic SSL Protocol Error

  • SSL Handshake Failed Error

    The SSL/TLS handshake error may be triggered when your server and a visitors’ browser fails to establish a secure connection. There are several reasons why this may happen.

    The most notable ones include incorrect date and time settings on the users’ browser, browser configuration issues, third-party interception, mismatched SSL versions and invalid SSL certificates. When you get or you’re notified of this error on your website, it is important that you investigate the issue based on the browser or server involved.

How to Fix SSL Errors?

For website owners, fixing SSL errors promptly is essential if you want to win the trust and confidence of your visitors. For users, these SSL connection errors clearly indicate that the encryption protocols of the website you’re trying to access are not functioning correctly.

So, you shouldn’t proceed to share any sensitive data on that website. Here is a simple step-by-step process for how to fix the most common SSL errors:

  • Issue Diagnosis

    The first step in fixing SSL errors is to diagnose the issue. One of the most effective approaches to go about this is by using online tools designed for SSL issue diagnosis.

    The popular options you can utilize here include; SSL Checker, SSL Server Test, and SSL Certificate Checker. These tools analyze different aspects of the SSL certificate installed on your website to pinpoint the most likely triggers of the errors. Some important details these tools check for include installation status, an accurate domain name listing, and expiration dates.

  • Installing an Intermediate Certificate

    If, from the diagnosis, the issue is due to an untrusted CA, you can install an intermediate certificate on your web server. Intermediate certificates help web browsers verify that your website’s certificate originates from a legitimate root certification authority.

    You should begin by checking if your web hosting provider offers guidance or tools for installing intermediate certificates. If not, don’t worry; navigate to your website’s server settings and locate specific instructions for your server to proceed with the installation.

  • Generate another Certificate Signing Request (CSR)

    If the first two options still don’t fix your website’s SSL errors, chances are you installed the certificate incorrectly. Try generating a new Certificate Signing Request (CSR) to fix this.

    This way, you can request a fresh certificate from your provider and potentially get the SSL error fixed. Keep in mind that every server comes with its own specific procedures for generating the CSR, so you may seek professional help or refer to a reliable resource like this one to find the specific instructions for your server.

  • Try Upgrading to a Dedicated IP Address

    If you’re getting a name mismatch error, the problem could be with you sharing an IP address with several other websites. Note that when you enter your domain name in the browser, it connects to your site’s IP address before reaching your site.

    Here’s the problem: if another site on the shared IP lacks a valid SSL certificate, some browsers may be confused and display the mismatch name error. To fix this, try upgrading to a dedicated IP address for your site so browsers can identify it correctly and resolve the issue.

  • Obtain a Wildcard SSL Certificate

    If the name mismatch error persists, consider getting a wildcard SSL certificate to resolve the issue. A wildcard SSL certificate will help you safeguard not just your root domain but several other domains simultaneously. This will ensure blanket protection across your entire online presence.

  • Change all your URLs from Insecure HTTP to Secure HTTPS

    If you’re still getting mixed content errors on your website, you may want to turn to tools like WhyNoPadlock. This tool can help you identify the elements triggering the errors.

    All you’ll need to do is paste your page URL and let the tool do all the work. After identifying the elements triggering the errors, edit the page’s source code and replace the URLs of all the insecure elements with HTTPS. Your hosting provider can help if you encounter problems when changing URLs to HTTPS.

  • Check your SSL Certificate Status

    This should be the first thing to do if your website throws errors like NET::ERR_CERT_DATE_INVALID. If the certificate is past its validity period, you must renew it promptly.

    To check the status of your SSL certificate, click the padlock icon on the top left end of your Chrome browser in the search bar. After that, select “Connection is secure” and click “Certificate is valid.”

Now, while the specifics may vary depending on the web host you’re using or your CA, the general process for installing an SSL certificate remains the same. Generate your Certificate Signing Request (CSR), activate it, and install the renewed certificate.

Best Practices for SSL Certificate Management

To protect sensitive data and maintain trust, diligently following best practices for SSL certificate management is non-negotiable. It is a necessity you just can’t afford to overlook. Here is a roundup of the best practices for SSL certificate management:

  1. Updating SSL Protocol Versions and Configurations

    It is ideal that you keep SSL protocol versions and configurations updated to maintain secure SSL environments. Here are a few quick recommendations:

    • Disable older, insecure versions of SSL/TLS protocols, like SSL 2.0 and SSL 3.0.
    • Implement strong cipher suites to ensure robust encryption and authentication.
    • Stay up-to-date with the latest SSL/TLS protocol versions recommended by security standards.
    • Regularly review and update SSL configuration settings based on security best practices and industry standards.
  2. Avoiding Mixed Content Issues

    Mixed content occurs when a website served over HTTPS includes insecure HTTP resources. This can compromise the security of the entire website. To avoid mixed content issues:

    • Ensure that all resources (images, scripts, and style sheets) are served over HTTPS and use relative URLs or protocol-relative URLs.
    • Perform regular checks and audits to identify and resolve any mixed-content warnings or errors.
    • Use Content Security Policy (CSP) headers to enforce HTTPS usage and prevent insecure content loading.
  3. Regular SSL Certificate Renewals and Updates

    SSL certificates have an expiration date, and failing to renew them in a timely manner can result in security warnings and potential disruptions. Follow these best practices:

    • Maintain a centralized inventory of all SSL certificates and their expiration dates.
    • Set up automated reminders and alerts to ensure the timely renewal of SSL certificates.
    • Consider implementing a Certificate Management System (CMS) to streamline the certificate lifecycle, including issuance, renewal, and revocation.
    • Stay updated with the latest industry practices and security requirements, and periodically review the validity and appropriateness of SSL certificate vendors.
  4. Periodic Updates for SSL Certificate Security

    SSL certificates can become vulnerable due to security vulnerabilities or compromised private keys. To address these risks:

    • Regularly monitor and apply security patches and updates provided by the SSL certificate vendors.
    • Stay informed about any security advisories or vulnerabilities affecting SSL certificate providers and take the necessary actions promptly.
    • Periodically regenerate private keys and reissue certificates to enhance security.
  5. Continuous Monitoring and Testing

    Maintaining a secure SSL environment requires ongoing monitoring and testing. Follow these practices:

    • Implement SSL certificate monitoring to track certificate expirations, changes, and vulnerabilities.
    • Conduct regular vulnerability assessments and penetration testing to identify any weaknesses in the SSL implementation.
    • Keep abreast of emerging security threats, industry standards, and best practices for SSL certificate management.


SSL is your shield against cyber threats. Don’t ignore SSL errors; they expose vulnerabilities that can have significant consequences. Keep safe, build trust, and be successful in the online world.

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