SSL: logging levels of errors observed with BoringSSL. As tested with tlsfuzzer with BoringSSL, the following errors are certainly client-related: SSL_do_handshake() failed (SSL: error:10000066:SSL routines:OPENSSL_internal:BAD_ALERT) SSL_do_handshake() failed (SSL: error:10000089:SSL routines:OPENSSL_internal:DECODE_ERROR) SSL_do_handshake() failed (SSL: error:100000dc:SSL routines:OPENSSL_internal:TOO_MANY_WARNING_ALERTS) SSL_do_handshake() failed (SSL: error:10000100:SSL routines:OPENSSL_internal:INVALID_COMPRESSION_LIST) SSL_do_handshake() failed (SSL: error:10000102:SSL routines:OPENSSL_internal:MISSING_KEY_SHARE) SSL_do_handshake() failed (SSL: error:1000010e:SSL routines:OPENSSL_internal:TOO_MUCH_SKIPPED_EARLY_DATA) SSL_read() failed (SSL: error:100000b6:SSL routines:OPENSSL_internal:NO_RENEGOTIATION) Accordingly, the SSL_R_BAD_ALERT, SSL_R_DECODE_ERROR, SSL_R_TOO_MANY_WARNING_ALERTS, SSL_R_INVALID_COMPRESSION_LIST, SSL_R_MISSING_KEY_SHARE, SSL_R_TOO_MUCH_SKIPPED_EARLY_DATA, and SSL_R_NO_RENEGOTIATION errors are now logged at the "info" level.