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We know of log configurations that can log negotiated cipher-suite info in successful connections.

But what we need to do is to log the client cipher-suite info that HAProxy gets hold of during TLS Handshake, whether or not the connection negotiation is eventually successful.

Is there a way to achieve this?

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    Try to add %sslc variable to log format. cbonte.github.io/haproxy-dconv/1.8/configuration.html#8.2.4
    – Vadim
    Oct 2, 2018 at 16:46
  • @Vadim Thanks for the response. We have done that, however it logs cipher suite only if connections are successful. If negotiations fail leading to unsuccessful TLS, it does not log.
    – Ace
    Oct 2, 2018 at 17:24
  • If there will be no way with logs then use tcpdump )
    – Vadim
    Oct 2, 2018 at 18:42

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