If you’re reading this, you’ve probably encountered the dreaded err_ssl_version_or_cipher_mismatch error in WordPress.

It’s a headache, I know.

But fear not, my fellow webmasters, for I have ventured into the depths of SSL and emerged victorious, armed with knowledge to help you overcome this nuisance.

Understanding SSL and TLS

Before we jump into fixing the error, let’s talk about the main characters in this story: SSL and TLS.

What is SSL (Secure Socket Layer)?

SSL, or Secure Socket Layer, is a protocol that encrypts the data exchanged between a website and a user’s browser. This way, hackers can’t intercept and tamper with sensitive information (like credit card numbers and login credentials). SSL is crucial for website security, and it’s the reason why you see that little padlock icon next to the URL in your browser.

What is TLS (Transport Layer Security)?

TLS is the newer, more secure version of SSL. It’s also a protocol, but with improved security features. For simplicity’s sake, we’ll use SSL to refer to both SSL and TLS.

How SSL and TLS work together for website security

SSL and TLS work in tandem to secure data transmission between a server and a browser. They use a combination of protocols and cipher suites to encrypt and decrypt data.

Protocols determine the way encryption is performed, while cipher suites are sets of algorithms that handle encryption, decryption, and authentication.


Now that we have some background, let’s dive into the possible reasons behind the err_ssl_version_or_cipher_mismatch error in WordPress.

  1. Outdated SSL/TLS protocols: If your server is using an old or insecure version of SSL/TLS, browsers may refuse to establish a connection.
  2. Incompatible cipher suites: Sometimes, a browser and a server don’t share a common cipher suite, leading to a communication breakdown.
  3. Incorrect SSL certificate: An improperly installed or misconfigured SSL certificate can cause this error.
  4. Browser or server limitations: In rare cases, browser settings or server limitations can trigger the error.

SSL Certificate Basics

Understanding SSL certificates is essential in solving the error. Let’s break it down.

Types of SSL certificates

There are three primary types of SSL certificates:

  • Domain Validation (DV): The most basic level of SSL, which only verifies that you own the domain.
  • Organization Validation (OV): A step up from DV, it validates your organization’s identity, too.
  • Extended Validation (EV): The highest level of SSL certification, involving a thorough vetting of your organization.

How to obtain an SSL certificate

To get an SSL certificate, you can either:

  • Purchase one from a Certificate Authority (CA)
  • Obtain a free one from Let’s Encrypt

Installing an SSL certificate in WordPress

After obtaining your SSL certificate, you’ll need to install it on your server. The process varies depending on your hosting provider, so check their documentation for guidance.

Ensuring Proper SSL Configuration

Once your SSL certificate is installed, you need to ensure that it’s configured correctly.

SSL certificate chain

An SSL certificate chain is a series of certificates linking your SSL certificate to a trusted CA. Make sure your certificate chain is complete and correctly configured.

Configuring SSL/TLS protocols and cipher suites

Check your server’s SSL/TLS configuration to ensure it uses up-to-date protocols and compatible cipher suites. If necessary, consult your hosting provider for assistance.

Using online SSL testing tools

Online SSL testing tools, like SSL Labs’ SSL Server Test and Qualys SSL Labs, can help you identify any configuration issues. Run your website through one of these tools to get a comprehensive report on your SSL/TLS configuration.


Alright, it’s time to face the beast head-on. Let’s troubleshoot the err_ssl_version_or_cipher_mismatch error.

Verify SSL certificate installation

First, make sure your SSL certificate is properly installed. Double-check that you’ve followed your hosting provider’s instructions to the letter. If the error persists, you might need to contact their support team.

Update SSL/TLS protocols and cipher suites

If your server is running outdated SSL/TLS protocols or incompatible cipher suites, it’s time to update them. Consult your hosting provider’s documentation or support team for guidance on making the necessary changes.

Check for browser compatibility issues

Occasionally, a browser might have settings or limitations that cause the error. Try accessing your website from different browsers and devices to see if the issue is consistent.

If it only occurs in a specific browser, the problem may lie in its settings or compatibility.

Identify and resolve server limitations

In some cases, the issue could stem from server limitations, such as outdated software or hardware. Contact your hosting provider to inquire about possible limitations and solutions.

Common WordPress Plugins for SSL Management

To make your life a bit easier, here are some WordPress plugins that can help with SSL management:

  • Really Simple SSL: Automatically detects and configures your SSL settings.
  • WP Force SSL: Forces HTTPS on your entire website.
  • SSL Insecure Content Fixer: Detects and fixes insecure content, ensuring that all elements on your site are served over HTTPS.

Updating Your Web Server Configuration

Your web server’s configuration plays a crucial role in SSL and TLS management. Here’s a brief rundown of common server configurations:

Apache configuration for SSL

For Apache servers, you’ll need to modify the httpd.conf or ssl.conf files to update SSL/TLS protocols and cipher suites.

Nginx configuration for SSL

For Nginx servers, you’ll have to update the nginx.conf file to configure SSL/TLS protocols and cipher suites.

IIS configuration for SSL

For IIS servers, you can use the IIS Manager to update SSL/TLS settings.

Tips for Keeping Your SSL Configuration Secure

To keep your website secure and prevent future err_ssl_version_or_cipher_mismatch errors, follow these best practices:

  1. Regularly update SSL/TLS protocols to ensure your site uses the most secure and up-to-date encryption methods.
  2. Keep cipher suites updated and in line with industry standards.
  3. Monitor SSL certificate expiration to avoid unexpected lapses in security.

FAQ on err_ssl_version_or_cipher_mismatch

What is err_ssl_version_or_cipher_mismatch?

This error occurs when there’s a mismatch between the SSL/TLS protocols or cipher suites used by a website’s server and a user’s browser. The result? The browser and server can’t establish a secure connection, and the error appears, stopping users from accessing the site.

It’s a security measure to protect user data from potential threats.

Why does this error happen in WordPress?

The err_ssl_version_or_cipher_mismatch error in WordPress can arise due to various reasons, such as outdated SSL/TLS protocols, incompatible cipher suites, an incorrectly installed SSL certificate, or browser and server limitations.

Addressing these issues will help resolve the error and secure your website for users.

Can this error affect my website’s SEO?

Yes, it can. Modern search engines like Google prioritize secure websites, and encountering this error might lead to a lower search ranking.

Also, users who see the error are likely to leave your site and not return, increasing your bounce rate and negatively impacting your SEO.

How do I know if my SSL certificate is installed correctly?

To verify your SSL certificate installation, you can use online SSL testing tools like SSL Labs’ SSL Server Test or Qualys SSL Labs. These tools will provide you with a detailed report on your SSL/TLS configuration, helping you identify any issues or misconfigurations.

How do I update my SSL/TLS protocols and cipher suites?

Updating your SSL/TLS protocols and cipher suites depends on your server type (Apache, Nginx, or IIS) and your hosting provider. Consult their documentation or support team for guidance on making the necessary changes.

Are some browsers more prone to this error?

Some older browsers might not support modern SSL/TLS protocols and cipher suites, leading to the err_ssl_version_or_cipher_mismatch error. Always keep your browser up-to-date, and encourage your users to do the same.

Can I fix this error with a WordPress plugin?

While some WordPress plugins can help with SSL management, they might not directly fix the err_ssl_version_or_cipher_mismatch error.

To resolve the issue, you’ll need to address its root causes, such as updating SSL/TLS protocols, ensuring proper SSL certificate installation, and resolving browser or server limitations.

How can I prevent this error from happening in the future?

Stay proactive with your website’s SSL configuration by regularly updating SSL/TLS protocols, keeping cipher suites in line with industry standards, and monitoring SSL certificate expiration. Following these best practices will help prevent the error from reoccurring.

Do I need to hire a professional to fix this error?

While hiring a professional is always an option, you can also follow the steps outlined in this article to fix the error yourself.

If you’re unsure or uncomfortable making changes to your server configuration, contacting your hosting provider’s support team is a good idea.

What if the error persists after troubleshooting?

If you’ve tried everything and the error still persists, contact your hosting provider for assistance. They may be able to identify server limitations or other issues causing the error, and help you find a solution.

Ending thoughts on “err_ssl_version_or_cipher_mismatch”

You’re now equipped with the knowledge to vanquish the dreaded err_ssl_version_or_cipher_mismatch error in WordPress.

Remember, maintaining a secure SSL configuration is an ongoing process, so stay vigilant and keep your site’s security in tip-top shape. Happy troubleshooting, my fellow web warriors!

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