openssl s_client -cipher ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES256-GCM-SHA384 \ -connect example.com:443 The above list specifies two specific ciphers. Think of it like a zip file for keys & certificates, which includes options to password protect etc. Convert a root certificate to a form that can be published on a web site for downloading by a browser. Let's break this down into two parts. # openssl s_client -connect server:443 -CAfile cert.pem. To connect to an SSL HTTP server the command: openssl s_client -connect servername:443 would typically be used (https uses port 443). Contribute to openssl/openssl development by creating an account on GitHub. openssl s_client -connect ldap-host:636 -showcerts. example. You didn't specify why you wanted to use s_client.. For more information, see OpenSSL s_client commands man page in the OpenSSL toolkit. Extract a certificate from a server. A group of ciphers can also be passed. The handshake still passes OK because the extension appears to be non-essential (or at least considered to be such by openssl) and you get the connected TLS tunnel. To view a complete list of s_client commands in the command line, enter openssl -?. # openssl x509 -in cert.pem -out rootcert.crt. If the connection succeeds then an HTTP command can be given such as "GET /" to retrieve a web page. Accessing the s_server via openssl s_client. The following table includes some commonly used s_client commands. If it is to check the SSL certificate (which is why I came across your question), it still doesn't work with s_client as Magnus pointed out 7 years ago. First, making the HTTP request, and second, extracting your content from the response. TLS/SSL and crypto library. Making the HTTP request. Use the -servername switch to enable SNI in s_client. See man psql.. openssl s_client sni openssl s_client -connect example.com:443 -servername example.com. The hardest part here is that s_client closes the connection when its stdin gets closed. If it is to interact with the database, any decent client will do.psql can be called with the sslmode=require option. openssl s_client is not a particularly great tool for this, but it can be done. openssl s_client-connect www. $ openssl s_client -connect www.feistyduck.com:443 -servername www.feistyduck.com In order to specify the server name, OpenSSL needs to use a feature of the newer handshake format (the feature is called Server Name Indication [SNI]), and that will force it to abandon the old format. Hence in your test the openssl s_client command advertises that is supports NPN but the server turns a blind eye onto ot. As soon as you connect to the server, run: ehlo example.com. You will get output like below as reply: openssl s_client -starttls smtp -connect example.com:25 openssl s_client -starttls smtp -connect example.com:465 openssl s_client -starttls smtp -connect example.com:587. 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