Here's a great way to check certs on remote systems. I like it because if the remote system forwards you elsewhere, it still looks at the cert on the original remote system that you identified. In the example below, I pulled dates from www.geekstorm.net:
openssl s_client -connect www.geekstorm.net:443 -servername www.geekstorm.net 2>/dev/null | openssl x509 -noout -dates
