openssl s_client
OpenSSL command to create TLS client connections. More information: https://www.openssl.org/docs/manmaster/man1/openssl-s_client.html.
- Display the start and expiry dates for a domain's certificate:
openssl s_client -connect {{host}}:{{port}} 2>/dev/null | openssl x509 -noout -dates
- Display the certificate presented by an SSL/TLS server:
openssl s_client -connect {{host}}:{{port}}
- Set the Server Name Indicator (SNI) when connecting to the SSL/TLS server:
openssl s_client -connect {{host}}:{{port}} -servername {{hostname}}
- Display the complete certificate chain of an HTTPS server:
openssl s_client -connect {{host}}:443 -showcerts
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