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Mon, Jan 30, 2017 10:49 pm

Checking a website's security certificate with OpenSSL

You can use OpenSSL, which is commonly installed on Mac OS X and Linux systems and which is also available for other operating systems (the source code can be downloaded from OpenSSL Downloads and a Windows implementation is available at OpenSSL for Windows), to check the security certificate of a website using an openssl command in the form openssl s_client -showcerts -connect fqdn:port where fqdn is the fully qualified domain name (FQDN) of the website and port is the port that the website is listening on for HTTPS connections, which is usually well-known port 443, though it may sometimes be another port, such as the registered port 8443. The showcerts option instructs openssl to show all certificates in the public key certificate chain.

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