How To Fix ‘Err_Ssl_Version_Or_Cipher_Mismatch’ Error Guide

The Err_Ssl_Version_Or_Cipher_Mismatch issue can occur if any of the preceding stages are not followed correctly. So, what could be causing the ERR SSL VERSION OR CIPHER MISMATCH problem on your or another site?

The Err_Ssl_Version_Or_Cipher_Mismatch  Error Is a symptom of what?

Err_Ssl_Version_Or_Cipher_Mismatch happens exclusively on websites that encrypt access and exchange information using HTTPS encryption and SSL certificates.

The URL bar of these sites is frequently marked with a lock icon. Old web browsers or operating systems are another common cause of the Err_Ssl_Version_Or_Cipher_Mismatch issue. Let’s break down the error’s name a little further:


Multiple versions of SSL have existed since its inception.

This means that when a mistake happens, it’s easy to figure out where the problem lies — either the SSL version doesn’t match, or the encryption algorithm isn’t working since you’re not using the same cypher.

Err_Ssl_Version_Or_Cipher_Mismatch error can also be caused by:

  • Problems with the server.
  • Mismatching of the SSL certificate name with the hostname is causing this issue
  • No use is being made of the most recent version of TLS.
  • Problems with the RC4 Cipher Suite on the client side
  • If you’re still using an old OS or web browser, it’s possible that
  • Your antivirus software’s QUIC Protocol Settings conflict with your browser’s default security settings.
  • Inability to update SSL status

This error can be caused by any one of the above identified problems. It’s possible, though, to remedy these issues in the next step.

Also Read:

  1. CTF Loader
  2. CompatTelRunner.exe
  3. Err_Ssl_Version_Interference

Error Err_Ssl_Version_Or_Cipher_Mismatch: What Should You Do?

Each of the causes and what you can do to repair them will be laid out for you in this section.

Problems with the server – In order to determine if the problem is coming from the server, you must look at the following:

You should verify that the SSL certificate is valid – You may verify the validity of your SSL certificate with the free SSL certificate checker, and it takes only a few minutes to analyse your website’s SSL/TLS settings on your web server.

Qualys SSL Labs can be used to verify your SSL certificate’s validity. We recommend switching to an SSL certificate from a trusted CA if there is a problem with your current certificate.

You should verify that the certificate’s name is correct. Check to see if the domain name is the same as the certificate’s certificate name. A mismatch can also be caused by these things, according to SSL labs.

A content delivery system that does not support SSL is used on the website.
SSL is not used on this site, even though it shares an IP address with another website.
An outdated IP address for a different website can be found by looking for a domain name on a search engine.

When this error occurs, you are unable to use Chrome DevTools, which is further evidence that the certificate has a problem.

TLS 1.2 Should Always Be Used

TLS version 1.2 or higher is commonly employed by hosting service providers, regardless of whether an outdated or unsupported version of TLS is in use.

The TLS version and backward compatibility should be checked because some users may be using an older operating system that supports the older version of TLS.

Your SSL labs’ server test results can be used to verify the most recent TLS version. You can see what TLS version your site supports just underneath the site score.

Also, your server may support TLS 1.3 but not have it enabled. As a Chrome user, you can access these settings by typing “chrome:/flags” into the address bar. Enter ‘TLS 1.3’ in the search field to see the Chrome Experimental Page.

Local anchors TLS 1.3 hardening is listed in the search results, and enabling it requires selecting the enable button in the dropdown menu. You can try to access the website again by relaunching your web browser.

Verify The RC4 Encryption Family

Modern browsers do not support the RC4 cypher, an ancient encryption method. Err_Ssl_Version_Or_Cipher_Mismatch is likely to occur if your website is still using RC4 encryption.

The error can be avoided if you transfer your website from RC4 or disable it and add the TLS 1.3 protocol, which you can do by verifying what is displayed under the Cipher Suites in your SSL Labs setup page and making the necessary changes.

TLS 1.3 should be listed instead of RC4 in this case. The Protocol specifics section will show if RC4 is listed, and if so, it will be highlighted in red so that you can disable it.

Problems with the client’s side
The Err_Ssl_Version_Or_Cipher_Mismatch problem is likely to occur if your customer is using an outdated browser or operating system. Avoiding this mistake is as simple as:

Installing New Software and Updating Your Browser

SSL errors occur because older web browsers and operating systems do not support TLS 1.3. As a result, the most recent versions of operating systems and web browsers are highly recommended.

We’ll walk you through the process of updating Chrome here. Steps will be the same whether you’re using Chrome or Firefox. Chrome’s most recent version should be used.

To install the Chrome browser’s latest version:

You may check if you’re running the most recent version of Chrome by visiting the About Chrome page. Click on the update button if necessary. Afterwards, restart Chrome and view the site once more.

Disable The QUIC Method

Other security protocols, such as HTTP2, TLS/SSL, and others, can be replaced by QUIC (Quick UDP Internet Connections). It’s an unreleased Google project that uses User Datagram Protocol (UDP) to transmit small data packets over an open network.

Turning off the QUIC protocol will prevent the Err_Ssl_Version_Or_Cipher_Mismatch problem. The QUIC protocol can be disabled by performing the following steps:

Type ‘chrome:/flags’ into the address bar of the new Chrome Tab to access the experimental page. Enter ‘quic’ into the search field, and you’ll be presented with a list of all queries involving ‘quic’.

You’ll find ‘Experimental QUIC Protocol’ in the first few searches. Using the drop-down menu next to it, select the “disable” option.
Restart the computer. You will be able to access the website after the changes have been implemented.

Disabling the Antivirus Program A temporary barrier of protection between your browser and the web is created by antivirus software, causing complications with your browser’s settings.

Err_Ssl_Version_Or_Cipher_Mismatch is also a result of their SSL/HTTPS protection mechanism. As a result, you can temporarily disable your antivirus software to prevent the problem.

For the sake of research, turn off your antivirus software for at least a few minutes or an hour. After you’ve disabled it, go back to the website and see if the problem persists.

It’s not your antivirus that’s to blame if the problem persists. You may choose to disable the HTTPS scanning feature or use a different antivirus application if you can open the website without experiencing this problem.

How To Reset Your Computer’s SSL Status? 

The Err_Ssl_Version_Or_Cipher_Mismatch issue can also occur if your computer’s SSL state stores old SSL certificates that are no longer needed.

Using the following instructions, you can remove the SSL status from Windows.

Step 1: Search for “Internet Properties” in your browser’s search box and click on “Go.” Go to the Content tab once you’ve opened Internet Properties or Internet Options.

Step 2: Select the “Clear SSL State” option. Once you return to Chrome and begin browsing websites again, the old SSL certificates will be removed and a new one obtained.

Is There a Workaround If The Error Recurrence Is Persistent?

If you’re still getting the Err_Ssl_Version_Or_Cipher_Mismatch problem after trying all of the suggestions above, here’s what you may try:

The date and time on your computer will be reset if you do this. Remove all of your web browser’s cookies and cache. Your operating system may need to be upgraded. Alternately, you could try a different gadget.

Having an out-of-date system might also be a contributing factor. However, the problem can be resolved by updating your web browser and resetting the date and time on your computer.

Also Read:

  1. Mrt.exe
  2. No Internet Secured
  3. Err_Name_Not_Resolved


There is no doubt that seeing SSL problems is a frustrating experience, especially when it’s for a personal website. It is our goal that this guide has helped you solve your problem with SSL today.

Leave a comment if you have any more questions concerning the SSL problem and how to repair it — we’d love to hear from you!