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openssl s_client

OpenSSL command to create TLS client connections.

More information.

• 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

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