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This is not very common, but it could happen in say larger enterprise deployments that require RC4. 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. Check out our plans Check issued domain on SSL certificate Need a blazing-fast, secure, and developer-friendly hosting for your client sites? Kinsta is built with WordPress developers in mind and provides plenty of tools and a powerful dashboard. 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.
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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. Subscribe Now Check Out Our Video Guide to Fixing SSL Errors Join 20,000+ others who get our weekly newsletter with insider WordPress tips! Want to know how we increased our traffic over 1000%?
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