err_ssl_protocol_error on my own website

ERR_SSL_PROTOCOL_ERROR usually means SSL/TLS misconfiguration. Check certificate validity, install full chain, force HTTPS correctly, update TLS settings, clear cache, and test via SSL Labs for detailed diagnostics.
 
SSL/TLS misconfiguration is typically indicated by ERR_SSL_PROTOCOL_ERROR. Verify the authenticity of the certificate, install the whole chain, properly force HTTPS, update TLS settings, clear the cache, and test using SSL Labs for comprehensive diagnostics.
 
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