openssl s_client
OpenSSL command to create TLS client connections.
- 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}
- Display the complete certificate chain of an HTTPS server:
openssl s_client -connect {host}:443 -showcerts
Copyright © 2014—present the tldr-pages team and contributors.
This work is licensed under the Creative Commons Attribution 4.0 International License (CC-BY).