Fix: Err SSL version or cipher mismatch on Windows 10/11

by Andrew Wafer
Andrew Wafer
Andrew Wafer
Andrew is not just trying to bring you closer to Windows, but he's truly interested in this platform. He just happens to be passionate about sharing that knowledge... read more
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  • The Err SSL version or cipher mismatch error could be caused by certain security settings.
  • Make sure that the antivirus software isn't interfering with your browser.
  • Sometimes disabling specific browser features can solve this issue.

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Windows 10/11 and the browsers that are installed on your device are using built-in security features to protect your info and keep everything secured all the time. These built-in security tools determine if certain web pages are safe or not.

However, sometimes, your Internet access might be blocked, even if the websites that you’re visiting are safe. That explains why you’re getting the Err SSL version or cipher mismatch error.

This alert will also tell you that This site can’t provide a secure connection, meaning that the browser cannot verify the SSL certificate for the implied website or webpage.

While this is an extremely useful security feature, sometimes even trusted sites might be blocked too.

For example, you can receive the Err SSL version or cipher mismatch error when you try to sign in to your bank account.

What causes Err SSL version or cipher mismatch?

This is a certificate issue and it appears when the web browser and the server don’t support the same version of the encryption protocol.

If this happens you might one of the following messages:

  • The client and server don’t support a common SSL protocol version or cipher suite
  • Cipher mismatch/no shared cipher
  • Cipher suite mismatch

Luckily, there are ways to fix this error, and today we’ll show you how to do that.

How can I fix the Err SSL version or cipher mismatch error on Windows 10 & 11?

1. Check the website certificate

  1. Try to open the website that is giving you this error.
  2. Click the lock icon in the address bar.
  3. Look for Connection is secure option. You can click it to view more information.
  4. Now when you click on certificate, you’ll see a detailed information about it.

If you don’t see this message or the lock icon, it means that the website is using an expired certificate thus making it unsafe.

You can also check the security by doing the following:

  1. Right-click the page that is giving you this error and choose Inspect.
  2. Now click the arrow icon and choose Security.
  3. You should now see the certificate information.

Alternatively, you can try switching to a different browser to avoid this problem, and Opera might be the best choice because it offers great features and security.

2. Clear the cache

  1. Open Chrome.
  2. Now press: Ctrl + Shift + Delete.
  3. A new window will appear.
  4. Set the Time range to All time and click on Clear data.

3. Adjust security settings

  1. Open Chrome.
  2. In the search bar type the following and press Enter: chrome://flags
  3. Look for the Minimum SSL/TLS version supported the entry.
  4. Click on it and choose SSLv3.
  5. Select the Re-launch option.
  6. Restart Chrome and retry to establish your connection again.
Note icon
This option isn’t available in all versions of Chrome, and if you can’t find it, move to the next solution.

4. Disable quick protocol

  1. Open Chrome.
  2. In the search bar enter: chrome://flags/
  3. In the search type quic. Locate Experimental QUIC protocol and set it to Disabled.
  4. Save the changes and restart Chrome.

5. Clear the SSL Certificate cache

  1. Press the Windows key + R keyboard hotkeys for bringing the Run box.
  2. Type the line below and press Enter: inetcpl.cpl
  3. Switch to the Content tab. Click on Clear SSL state.
  4. Save your changes and close this window in the end.

Windows will store SSL certificate history by default to make your browsing experience faster.

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However, this might be the reason why you get the Err SSL version or cipher mismatch alert. So, clear the SSL Certificate cache by doing as described above.

6. Turn off SSL scanning from antivirus software

The Err SSL version or cipher mismatch issue could be caused by your antivirus program.

So, just disable the SSL scanning feature from your security programs before retrying your network connection.

Here is how you can complete this task on one of the most popular antivirus programs:

6.1 BitDefender:

  1. Open the BitDefender interface and access Settings.
  2. From there go to Privacy Control and switch to the Antiphishing tab.
  3. Disable Scan SSL.
  4. On other BitDefender versions you might have to access Protection and from under Web Protection, you can find the Scan SSL feature.

6.2 AVAST:

  1. Open Avast and navigate towards Settings.
  2. Select Protection and under Core Shields select Web Shield.
  3. From there you can disable the SSL scan.

6.3 Kaspersky:

  1. Access Kaspersky’s Settings page.
  2. From there go to Network Settings.
  3. SSL settings will be displayed at this point.
  4. Just disable the settings that are related to the SSL scan.

If you’re having problems with your antivirus, visit our guide on the best antivirus software for some great alternatives.

How can I fix the Err SSL version or cipher mismatch error on Windows 11?

This is a browser issue, meaning that solutions are the same on all versions of Windows. So even if you’re using the latest edition, all the methods from this guide should work for you, so be sure to try them.

The error is somehow similar to This website might not be trusted by your browser error. For more information on how to fix it, check out this website not trusted guide for more information.

What systems are affected by Err SSL version or cipher mismatch?

This is a pretty common error and err_ssl_version_or_cipher_mismatch has been reported on Windows, Android, and Mac systems. Servers can also suffer from this issue, and the list of affected servers includes:

  • Localhost
  • Tomcat
  • Cloudflare
  • Sonicwall
  • Nginx

Keep in mind that the Err SSL version error is a security alert that’s telling you one thing: You are trying to access a web page that cannot be trusted.

So, try to disable this alert only if you are sure that you can safely navigate towards the respective website.

Anyway, the steps above should help you solve the Err SSL version or cipher mismatch error in Chrome. If you’re still having problems, read our Secure connection failed SSL error guide for additional solutions.

We’d like to know your opinion on this subject, so drop us a comment in the section below.

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