SSL errors, verbosity level

shiz nginx-forum at
Sat Jul 7 15:38:40 UTC 2018


I see those messages in my error logs daily.

2018/07/07 08:01:32 [crit] 31935#31935: *342781 SSL_do_handshake() failed
(SSL: error:14209102:SSL
routines:tls_early_post_process_client_hello:unsupported protocol) while SSL
handshaking, client:, server:
2018/07/07 08:06:24 [crit] 31939#31939: *343099 SSL_do_handshake() failed
(SSL: error:1420918C:SSL
routines:tls_early_post_process_client_hello:version too low) while SSL
handshaking, client:, server:

Is there a way to increase verbosity, i.e. which protocol is unsupported? 
which version is too low?

Nginx 1.15.1, supporting TLSv1.2, TLSv1.3 draft 23, OpenSSL-1.1.1-pre2

Not sure if it could be done within nginx, maybe OpenSSL source has to be

Posted at Nginx Forum:,280446,280446#msg-280446

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