Certificate verification methods and sites

Server-side validation certificate, have the following methods and sites:

1. openssl client authentication

openssl s_client -servername domain1.hengzi.net.cn -connect domain1.hengzi.net.cn:443 -showcerts

 

2. SSL Labs

https://www.ssllabs.com/ssltest/analyze.html

 

3. DigiCert

https://www.digicert.com/help/

 

Further reference may blog:

https://kinsta.com/knowledgebase/ssl-check/