How to fix err_ssl_version_or_cipher_mismatch error for readers?

Question

Digital certificates

Good afternoon, some readers complain about an error when opening our site.
When opened, it says err_ssl_version_or_cipher_mismatch.
We use a Let's Encrypt certificate.
Bugs are seen on IOS safari browser and chrome.

Answer 1

Most likely it is a question to a hoster.
Something is not set up right there.
Help from chrome:

"Web page not available" or ERR_SSL_VERSION_OR_CIPHER_MISMATCH
This error occurs when you try to open a site with an outdated security code. For your protection, Chrome blocks such connections.
Are you the site owner? Try changing the server settings so that TLS 1.2 and TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 are used instead of RC4. The RC4 cipher is no longer considered secure. If you cannot disable RC4, make sure other ciphers are also enabled.

Answer 2

The site uses cipher suites that are considered insecure, or the site cannot agree with the browser on the cipher suites used. It manifests itself when:
- the list of cipher suites is too narrow on the site, and the browser is quite old
- or vice versa - only old cipher suites are on the site, and only new ones are allowed in the OS