tldr/pages/common/openssl-s_client.md

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2020-10-28 19:03:16 +00:00
# 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}} </dev/null`
- Display the complete certificate chain of an HTTPS server:
`openssl s_client -connect {{host}}:443 -showcerts </dev/null`