The error  ERR_SSL_OR_CIPHER_MISMATCH due to a lack of “common SSL protocol version or cipher suite support” between a web server and a user’s browser. This issue happens during the TLS handshake process. With that, the browser will automatically display this specific error message. There are different reasons for the error to be occured which are as follows:- 1) Outdated browsers or operating systems. 2) Use of old TLS versions, significantly older than TLS 1.2. 3) Web servers employ the outdated RC4 cipher suite. 4) Corrupted SSL state within the browser. Need to regularly update your browser and OS. Always check and clear your browser cache. Temporarily disable antivirus software if needed. Enable TLS 1.3 for enhanced security. Adjust Cloudflare’s SSL settings carefully. Lastly, consider disabling the QUIC protocol. Hope it helps! ... View more