Use the following tools to verify and test your SSL setup. Besides important basic requirements like a complete & valid Certificate Chain you can improve security of your SSL setup by carefully selecting high quality Cipher Suites. Additionally, configuring HTTP Strict Transport Security (HSTS) will further improve security.

WEBSERVER CHECK: Qualys SSL Labs https://www.ssllabs.com/ssltest/		WEBSERVER CHECK: GeoTrust SSL Checker https://ssltools.geotrust.com/checker/views/certCheck.jsp
WEBSERVER CHECK: Security HTTP Headers https://securityheaders.io		WEBSERVER CHECK: MOZILLA Observatory https://observatory.mozilla.org/

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Other useful tools:

Haredenize (Web and Mailserver check)
https://www.hardenize.com

CryptCheck (Ciphers)
https://tls.imirhil.fr/ | A interssl.com

HSTS preload
https://hstspreload.org/

ROBOT Attack Checker
https://robotattack.org/

Drown Attack Checker
https://drownattack.com/

SSL Certificate Search
https://crt.sh/?

badssl.com
https://badssl.com

Tutorial: HTTP public key pinning
https://scotthelme.co.uk/hpkp-http-public-key-pinning/