openssl s client -showcerts

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openssl s_client -showcerts -connect YOUR_DOMAIN.COM:443

openssl s_client -showcerts

Errors

openssl s_client -showcerts -connect google.com
40D741D72F7F0000:error:8000006F:system library:BIO_connect:Connection refused:../crypto/bio/bio_sock2.c:114:calling connect()
40D741D72F7F0000:error:10000067:BIO routines:BIO_connect:connect error:../crypto/bio/bio_sock2.c:116:connect:errno=111

openssl s_client -showcerts  https://google.com
40B78119DD7F0000:error:10080002:BIO routines:BIO_lookup_ex:system lib:../crypto/bio/bio_addr.c:738:Servname not supported for ai_socktype connect:errno=0

See also

openssl, openssl s_client
TLS, mTLS: OpenSSL, LibreSSL, BoringSSL, WolfSSL, X.509, .pem, SNI, CT, OCSP, Mbed TLS, ALPN, your connection is not private, SSL Certificate Checker, Wildcard certificate, JA3 fingerprint, sslcan, TLS inspection

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