openssl s client -showcerts
openssl s_client -showcerts -connect YOUR_DOMAIN.COM:443 openssl s_client -showcerts -connect google.coom:443
openssl s_client -showcerts
self signed certificate
openssl s_client -showcerts -connect google.com:443 CONNECTED(00000006) depth=0 OU = "No SNI provided; please fix your client.", CN = invalid2.invalid verify error:num=18:self signed certificate verify return:1 depth=0 OU = "No SNI provided; please fix your client.", CN = invalid2.invalid verify return:1 write W BLOCK --- Certificate chain 0 s:/OU=No SNI provided; please fix your client./CN=invalid2.invalid i:/OU=No SNI provided; please fix your client./CN=invalid2.invalid -----BEGIN CERTIFICATE----- MIIDfDCCAmSgAwIBAgIJAJB2iRjpM5OgMA0GCSqGSIb3DQEBCwUAME4xMTAvBgNV
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
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