Openssl s_server s_client example

1. What is s_client in openssl?
2. What is openssl S_server?
3. How to test SSL connectivity using openssl s_client commands?
4. What is the use of openssl s_client connect?

What is s_client in openssl?

OpenSSL's s_client command can be used to analyze client-server communication, including whether a port is open and if that port is capable of accepting an SSL/TLS connection. It is a useful tool for investigating SSL/TLS certificate-based plugins, and for confirming that a line of secure communications is available.

What is openssl S_server?

The s_server command implements a generic SSL/TLS server which listens for connections on a given port using SSL/TLS.

How to test SSL connectivity using openssl s_client commands?

In the command line, enter openssl s_client -connect <hostname> : <port> . This opens an SSL connection to the specified hostname and port and prints the SSL certificate. Check the availability of the domain from the connection results.

What is the use of openssl s_client connect?

Use the openssl s_client -connect flag to display diagnostic information about the SSL connection to the server. The information will include the servers certificate chain, printed as subject and issuer. The end entity server certificate will be the only certificate printed in PEM format.