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OpenSSL certificate diagnostics and verification
OpenSSL certificate diagnostics and verification

OpenSSL certificate diagnostics and verification

Displays a server certificate list sent by the SSL server (How to get Issuer CA Certificates of a Custom Certificate)
The s_client command implements a generic SSL/TLS client which connects to a remote host using SSL/TLS. It is a very useful diagnostic tool for SSL servers.

echo quit | openssl s_client -showcerts -servername buzzingmaxx.cloudns.org -connect buzzingmaxx.cloudns.org:443

Get Cert Chain

https://crt.sh/