Using openssl to test SSL connection

Install openssl

Connect to server

openssl s_client -connect youserver.com:443 -showcerts


CONNECTED(00000164)
depth=2 C = US, O = GeoTrust Inc., CN = GeoTrust Global CA
verify return:1
depth=1 C = US, O = GeoTrust Inc., CN = RapidSSL SHA256 CA
verify return:1
depth=0 CN = yourserver.com
verify return:1
---
Certificate chain
 0 s:/CN=yourserver.com
   i:/C=US/O=GeoTrust Inc./CN=RapidSSL SHA256 CA
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
 1 s:/C=US/O=GeoTrust Inc./CN=RapidSSL SHA256 CA
   i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
---
Server certificate
subject=/CN=yourserver.com
issuer=/C=US/O=GeoTrust Inc./CN=RapidSSL SHA256 CA
---
No client certificate CA names sent
Peer signing digest: SHA1
Server Temp Key: ECDH, P-521, 521 bits
---
SSL handshake has read 3100 bytes and written 558 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-SHA384
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES256-SHA384
    Session-ID: ED280000CF500FD12BFD3637345041B63883D2BE08BB1E94B6E5DDBD18AD0C7A
    Session-ID-ctx:
    Master-Key: E0DCBBE41656F4118954F91B9E9B63BEF98576173C5BC48DF8B62446F0357700FC86C1BA6157EC7BCFCF
20EB485897B5
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1468613406
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)

Send HTTP commands

GET / HTTP/1.1

Host: youserver.com