--- OPENSSL ---
https://www.redhat.com/sysadmin/6-openssl-commands Test Certs for Site https://www.sslshopper.com/article-most-common-openssl-commands.html Look at contents of CRT/PEM &. CHAIN ... openssl x509 -in server.crt -text |more openssl x509 -in DigiCertCA.crt -text |more Look at contents of KEY ... openssl rsa -in server.key -check Return CERT from a website openssl s_client -connect centosone.binghamton.edu:443 -CApath /etc/httpd/ssl /var/www/Upload/certs-202.tar server.key server_DigiCertCA.crt server.crt