Fingerprint
#SHA1
openssl s_client -connect <host>:<port> < /dev/null 2>/dev/null | openssl x509 -fingerprint -noout -in /dev/stdin
#SHA256
openssl s_client -connect <host>:<port> < /dev/null 2>/dev/null | openssl x509 -fingerprint -sha256 -noout -in /dev/stdin
Serial
openssl s_client -connect <host>:<port> < /dev/null 2>/dev/null | openssl x509 -serial -sha256 -noout -in /dev/stdin
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