[openssl-users] How to get SNI info from s_client debug logs?

Salz, Rich rsalz at akamai.com
Mon Nov 27 13:27:05 UTC 2017

  *   1. Why does s_server need option "-servername"?

For debugging, so that you can test that clients are sending the right SNI extension and properly handling the TLS error when they don’t.

  *   2. It looks options -servername and -alpn cannot work together.

Yes, kind-of.  The s_client and s_server programs aren’t fully-featured production programs.
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