[openssl-users] letter 's' in s_client in openssl

Wouter Verhelst wouter.verhelst at fedict.be
Mon Jan 4 10:15:10 UTC 2016

On 04-01-16 11:11, Kaushal Shriyan wrote:
> Hi,
> what does the letter 's' signify in *s_client* in the command "openssl
> s_client -servername test.example.com <http://test.example.com> -connect
> test.example.com:443 <http://test.example.com:443> -showcerts" ?

The man page starts with:

S_CLIENT(1SSL)                OpenSSL                     S_CLIENT(1SSL)

        s_client - SSL/TLS client program

So, I'd guess it stands for "SSL". What else? ;-)

Wouter Verhelst

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