Demystifying the ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error: What It Is and How to Fix It

Hello, tech enthusiasts and casual browsers alike! Today, we’re going to venture into a topic that might seem a little arcane but is surprisingly common: the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error. While the error code itself looks like a jumble of tech jargon, I assure you it’s something that most internet users have encountered at least once. So, without further ado, let’s delve into what this error is and how to resolve it.


In simple terms, the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error occurs when your browser cannot establish a secure connection to a website due to some SSL (Secure Sockets Layer) issues. SSL is the technology that encrypts the data between your browser and the server, ensuring a secure transfer of information. The error typically manifests as a warning page that prevents you from accessing the site you’re trying to visit, accompanied by the intimidating error code.

Why Does This Error Occur?

There are several reasons you might encounter this issue:

  1. Outdated SSL Certificate: The website might be using an SSL certificate that’s expired or not up to current standards.
  2. Incompatible Browser or OS: Older browsers or operating systems may not support the latest SSL protocols, causing this error.
  3. Server Configuration: The server’s SSL configuration may not match what your browser expects, resulting in a mismatch.
  4. Client-Side Issues: Sometimes, the issue can stem from your own computer, like incorrect system time or cached data causing the error.


For Web Users:

  1. Update Your Browser: Make sure you’re using the latest version of your web browser, as updates often include security improvements.
  2. Clear Browser Cache: Old cache data can sometimes interfere with SSL connections. Clearing your cache may resolve the issue.
  3. Check System Time: Incorrect system time can invalidate SSL certificates. Ensure your computer’s time settings are accurate.
  4. Disable Browser Extensions: Some browser extensions can interfere with SSL/TLS. Try disabling them to see if the error persists.
  5. Use a Different Browser: Sometimes the problem may be specific to the browser you’re using. Try accessing the website using a different browser.

For Website Owners:

  1. Renew SSL Certificate: If your SSL certificate is outdated, renew it and make sure it meets the current standards.
  2. Update Server Configuration: Check your server’s SSL settings and update them if necessary.
  3. Check Cipher Suite: Make sure your server’s cipher suite is compatible with current browsers.
  4. Consult Web Host or Server Admin: If you’re not comfortable tinkering with server settings, consult your web host or a server administrator.

Closing Thoughts

While the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error may look daunting, it’s usually a straightforward issue to resolve. For web users, a little bit of browser maintenance can often do the trick. For website owners, keeping your SSL certificates and server settings up to date is key.

Encountered this error before? Have other troubleshooting tips? Feel free to share your experiences and questions in the comments below!

About Robin Scott

I'm Robin Scott, a WordPress Consultant and WooCommerce expert developer who, along with three other people, runs a business called Silicon Dales Ltd remotely, from a base in the North of the UK. I enjoy using my talents for programming to track and interpret sporting, political or retail data - and therefore you'll see me posting some content in these spaces in this, my personal website. If you're interested to talk about leveraging this for your business (in sport, entertainment, retail, etc) please contact me.

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