Solution Err_ssl_version_or_cipher_mismatch - SupportHost (2023)

In this guide, err_ssl_version_or_cipher_mismatch: How to Fix It, we look at what the err_ssl_version_or_cipher_mismatch error is and how to fix it so that you can access the website again.

First, let's see how the error appears in different browsers and then we'll look at the main causes of this problem. Finally, let's look at the different ways to fix the error, either on your website or while browsing, looking at server-side and client-side issues one by one.

Table of contents

What is the error err_ssl_version _or _cipher_mismatch?

Whenever we access a website using the HTTPS protocol, the browser needs to contact the server. The exchange of messages between the client (the browser) and the server is calledSSL/TLS-Handshake.

This browser-server communication also includes the verification of the SSL certificate by the browser. SSL certificate verification is performed each time we connect to a website and is used to ensure that the connection to that website is secure.

If, during the TLS handshake, the browser detects an unsupported version of the SSL protocol or problems with configuration and encryption, an error message, err_ssl_version_or_cipher_mismatch, may appear.

Since this is an error related to SSL certificate validation, this problem can only occur on websites that use HTTPS protocol and security certificates. Please note that when migrating from , most websites have adopted the new security protocolHTTP ein HTTPS.

Variants of err_ssl_version_or_cipher_mismatch

An error page appears in Chrome with the warning "The website cannot provide a secure connection". Below is what the err_ssl_version_or_cipher_mismatch error looks like in Chrome.

Solution Err_ssl_version_or_cipher_mismatch - SupportHost (1)

The same error message appears withMicrosoft-Rand, with a warning "The connection to this website is not secure.“.

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On the other hand, if you visit the same website withfire foxYou may encounter a similar error, but with a slightly different warning. FOR "secure connection failedFirefox displays an error with the error code: ssl_error_no_cypher_overlap.

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In all cases it is not possible to continue browsing andYou cannot access the website.

Err_ssl_version_or_cipher_mismatch: as causes for errors

The err_ssl_version_or_cipher_mismatch error is usually caused by using outdated or outdated browsers or operating systems.

However, there are other reasons why you might get this error message. Here is a list of the most common.

  • Invalid SSL certificate: Problems with the website's SSL certificate, such as a mismatch between the certificate's domain and the website's domain, can cause this error.
  • Outdated browsers or operating systems: In this case, the problem is that the browser or operating system does not support the latest version of TLS.
  • The QUIC-Protokoll sends the problem.
  • TLS version: The error can occur if the TLS version used on the server is no longer supported by the browser.
  • Issues with cache, antivirus or CDN.

How to fix err_ssl_version_or_cipher_mismatch error

The err_ssl_version_or_cipher_mismatch error can be caused by server-side issues such as outdated TLS versions or certificate issues, or it can be a client-side error depending on the browser or operating system used.

Server side problems

The err_ssl_version_or_cipher_mismatch error can be mainly caused by these three issues:

  • Domain name mismatch in certificate
  • Server with a TLS version that is no longer supported
  • Server with an encryption that is no longer supported.

In any case, let's explore how to understand if the error is caused by one of these issues and what to do to fix it.

Check the SSL certificate, TLS version and encryption

If you encounter the err_ssl_version_or_cipher_mismatch error on your website, the first thing you should do is make sure that the website's SSL certificate is valid.

As we mentioned when we talked about the causes of the error, one of the reasons why this warning can appear is due to problems with the SSL certificate.

There are several methods you can follow to verify the SSL certificate, one of the easiest ways is to verify using a free online tool such asSSL-Server-TestQualys SSL-Labors.

The tool is very easy to use and allows you to identify problems with your SSL certificate, such as: B. whether it is expired, invalid or corrupted.

Connect to the tool's website and enter the domain of the website where the error occurs to perform SSL certificate check and clickDelivery.

Solution Err_ssl_version_or_cipher_mismatch - SupportHost (4)

Let's see what errors the tool can identify and guide us on the right path to fix err_ssl_version_or_cipher_mismatch error.

incompatibility error

One of the problems that can occur with the SSL certificate and generate the err_ssl_version_or_cipher_mismatch error is when there is no match between the domain name in the certificate and the domain.

In this case, when we analyze the website's SSL certificate, the SSL Labs tool notifies us of the incompatibility through this warning message.”Incompatible certificate name“.

Solution Err_ssl_version_or_cipher_mismatch - SupportHost (5)

In addition to the certificate conflict, the tool also lists possible causes for the certificate conflict. The discrepancy may actually depend on the following reasons:

  • The analyzed website does not use SSL protocol but shares its IP address with another website that uses it.
  • The website no longer exists, for example the domain points to an old IP address which is now hosting another website.
  • The website uses a CDN that does not support SSL.
  • The alias used for the domain was not included in the certificate.

Note that this last possibility can also occur for variants with and without www. For example, if the domain name in the certificate is "" and the domain visited is "".

You can also check which domain names the certificate is valid for by viewing the details directly in your browser.

To do this, click on the icon next to the address as shown in this screenshot and clickcertificate.

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open thisdetailsguide and clickSubject alternative nameto view the domains covered by the certificate.

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Remember thatSSL Certificateswith wildcards like * apply to all subdomains like:, or

Outdated TLS version

We can also use SSL Labs certificate verification tool to verify what TLS version is on the server hosting the website.

Since newer browsers no longer support TLS versions 1.0 and 1.1, the browser may display the error err_ssl_version_or_cipher_mismatch or err_ssl_obsolete_version if the website is still using one of these older versions

Solution Err_ssl_version_or_cipher_mismatch - SupportHost (8)

In this case, you will see a warning like this when running the SSL Labs test.

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You can check the details by scrolling downConfiguration: ProtocolsSection where you can see which TLS versions are supported.

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If the server is using a TLS version that newer browsers no longer support, you should contact your ISP, report the problem, and request an update.

Active RC4 encryption

We can also use SSL Labs' testing tool to check which cipher suite the server is using.

Remember that the latest versions of Chrome, Firefox, Edge and Internet ExplorerI no longer supportIsRC4 Figurenset.

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Therefore, if the server continues to use this configuration, it is better to disable it and use another one.

CDN setup issues

In some cases, the err_ssl_version_or_cipher_mismatch error can be CDN dependent. If you are using Cloudflare services, it may be helpful to disable and re-enable Universal SSL in the SSL/TLS section.

Solution Err_ssl_version_or_cipher_mismatch - SupportHost (12)
Solution Err_ssl_version_or_cipher_mismatch - SupportHost (13)

Client-side issues

The err_ssl_version_or_cipher_mismatch error may depend on browser settings.

In particular, the cases we study are:

  • outdated data stored in the cache
  • unsupported TLS versions
  • Active QUIC protocol
  • Outdated operating system or browser.


Clearing your browser's cached data can be helpful to fix the err_ssl_version_or_cipher_mismatch error. You can follow our step-by-step guide to see how to do itLimpar is hidingthe main browsers.

If clearing the cache is not enough, you can also try clearing the SSL cache. On Windows, just open theSwitchboardand clickinternet options.

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Then clickSatisfiedtab and then nextclear ssl statusis good

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All you have to do is restart your browser to see if the error is resolved.

This system can also help you fix other SSL certificate related errors such as:ERR_CERT_AUTHORITY_INVALID.

Enable TLS in your browser

If your browser is up to date, TLS 1.3 support should already be enabled. If not, you can also enable it manually. Let's see how this goes in Chrome.

Open your browser and visit chrome://flags/ to access the browser's experimental options.

Search for "tls" in the search bar at the top and set the TLS 1.3 option toactivatedas seen in this screenshot.

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You can also enable TLS versions at the system level. On Windows, just open the Control Panel and clickinternet options.

Solution Err_ssl_version_or_cipher_mismatch - SupportHost (17)

click noProgressiveand enable the options "Use TLS 1.0, 1.1...1.3" and click OK.

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This option can help you avoid the err_ssl_version_or_cipher_mismatch error, but if the error occurs on your website because you are using an outdated version of TLS, you should upgrade to the more secure version of the protocol.

This way, even users using newer browser versions can visit your website without encountering errors like err_ssl_version_or_cipher_mismatch or err_ssl_obsolete_version.

Disable the QUIC protocol

In some cases, the occurrence of errors like err_ssl_version_or_cipher_mismatch can be caused by the QUIC protocol. Let's see how to check if it's active in Chrome and how to disable it.

Open Chrome and visit chrome://flags, then search for "QUIC" in the top search bar.

The option you need to find is "Experimental QUIC Protocol". To disable it, just selectdeactivatein the drop down menu as seen here.

Solution Err_ssl_version_or_cipher_mismatch - SupportHost (19)

Disable antivirus (temporarily)

If you have not been able to fix the err_ssl_version_or_cipher_mismatch error using the methods discussed so far, try temporarily disabling the antivirus program you are using.

This way you can find out if the error is due to incorrect program settings.

Update your browser or operating system

As we explained at the beginning of this guide, the err_ssl_version_or_cipher_mismatch: How to fix, err_ssl_version_or_cipher_mismatch error can be generated by outdated browser or operating system versions.

For example, older browser versions may not support current popular protocols such as TLS 1.3. If the error persists, try updating or reinstalling your browser.

Likewise, the problem can be caused by older operating systems such as Windows XP or Windows Vista. These operating systems may not be compatible with the latest browser versions and this could be the cause of the error.

In this case, updating the operating system can fix the problem.


In this guide, err_ssl_version_or_cipher_mismatch: How to Fix It, we saw what causes the err_ssl_version_or_cipher_mismatch error. The problem could be due to the operating system or browser you are using, or it could depend on the website's SSL certificate or server settings.

Thanks to handy online tools like the ones we've got to know in this guide, it's easier to identify the causes of the error and fix it.

If yes, was the error on your website or on a website you were trying to visit? Were you able to find out what caused it? Let me know which method you used to solve it in the comments below.


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