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TLS 1.3 server support Check RC4 Cipher SuiteĪnother reason according to Google’s documentation for ERR_SSL_VERSION_OR_CIPHER_MISMATCH is that the RC4 cipher suite was removed in Chrome version 48.

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If it is old, reach out to your host and ask them to update their TLS version. Under configuration, it will show you the current version of TLS running on the server with that certificate. This is something the SSL Labs tool can also help with. (Suggested reading: if you’re using legacy TLS versions, you might want to fix ERR_SSL_OBSOLETE_VERSION Notifications in Chrome). Cloudflare also enables TLS 1.3 by default. Kinsta supports TLS 1.3 on all of our servers and our Kinsta CDN.

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If you are a Kinsta customer you never have to worry about this as we always upgrade our servers to the latest and greatest supported versions.

Ideally, it should be running at least TLS 1.2 (better yet, TLS 1.3). Check for Old TLS versionĪnother possible reason is that the TLS version running on the web server is old.

That is where a tool like SSL Labs can come in handy. However, in our case, the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error actually prevented us from being able to check it in Chrome DevTools. Remember though, there are wildcard certificates and other variations, but for a typical site, it should match exactly. If this doesn’t match the current site you’re on, this is a problem. Right-click anywhere on the website and click on “Inspect.” Then click on the security tab and click on “View certificate.” The issued domain will show in the certificate information.

The domain name alias is for a website whose name is different, but the alias was not included in the certificate.Īnother easy way to check the current domain name issue on the certificate is to open up Chrome DevTools on the site.

The site uses a content delivery network (CDN) that doesn’t support SSL.

The site no longer exists, yet the domain still points to the old IP address, where some other site is now hosted.

The site does not use SSL, but shares an IP address with some other site that does.

As SSL Labs states, a mismatch can be a number of things such as: As you can see from the SSL Labs test below, this is pretty quick and easy to diagnose. In this particular instance, the customer migrating to Kinsta had a certificate name mismatch which was throwing up the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error. Check SSL certificate Check for Certificate Name Mismatch It could take a minute or two to scan your site’s SSL/TLS configuration on your web server. You can also select the option to hide public results if you prefer. It is very reliable and we use it for all Kinsta clients when verifying certificates. Simply input your domain into the Hostname field and click on “Submit.” Check Out Our Video Guide to Fixing SSL Errors

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If you see this error, the first and easiest place to start is to perform an SSL check on the certificate that is installed on the site. We recommend using the free SSL check tool from Qualys SSL Labs.

The client and server don’t support a common SSL protocol version or cipher suiteĬheck out reasons below on why this happens and what you can do about it.

Error 113 (net::err_ssl_version_or_cipher_mismatch): unknown error.

You might also see a variation of the error, such as:

Chrome is actually protecting you by not letting you load it. We were, of course, running the latest version of Chrome, so the issue was with their SSL certificate. In fact, we just recently encountered a user having this issue on their WordPress site who was migrating to Kinsta from another host.

The ERR_SSL_VERSION_OR_CIPHER_MISMATCH error typically happens on older operating systems or browsers.īut that is not always the case. What Causes the ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error?

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If for some reason the browser doesn’t like what it sees, such as a misconfiguration or unsupported version, your browser might display the following error: “ERR_SSL_VERSION_OR_CIPHER_MISMATCH” which prevents you from accessing the site.Ĭheck out a few recommendations on how to fix this error. What Is the ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error? Some of these include the TLS handshake, the certificate being checked against the certificate authority, and decryption of the certificate.

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When you visit a website running over HTTPS a series of steps are performed between the browser and the web server to ensure the certificate and SSL/TLS connection is valid.