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Openssl s_client -connect :443ĭepth=2 OU = GlobalSign Root CA - R3, O = GlobalSign, CN = GlobalSignĭepth=1 C = BE, O = GlobalSign nv-sa, CN = GlobalSign Organization Validation CA - SHA256 - G2ĭepth=0 C = US, ST = California, L = San Francisco, O = 'Wikimedia Foundation, Inc.', CN = *.Ġ s:/C=US/ST=California/L=San Francisco/O=Wikimedia Foundation, Inc./CN=*.

… will show me basic information about the connection that OpenSSL is able to establish with the server: Examining Server SSL/TLS Configurationīy default, just connecting with: openssl s_client -connect hostname:port This allows me to perform a number of useful activities.

The s_client sub-command implements a generic SSL/TLS client, which connects to a remote server using SSL/TLS. In my experience, the s_client sub-command is particularly useful when interacting with servers via SSL/TLS. I use it for a huge number of tasks: generating new X.509 certificate signing requests, generating random strings for encryption keys, retrieving server X.509 certificates, testing support SSL/TLS ciphers, etc. One of the most useful utilities in my toolbox is OpenSSL. I frequently troubleshoot SSL/TLS server configurations, X.509 certificates, and other SSL/TLS-related concerns.

Openssl sclient connect