Step 4: Click Certificates, and select Add. How to check ssl certificate on localhost How to check the details of an ssl certificate Last Modified: Dec 19, 2017, 3:50 pm If you're not sure if the certificate you're using is new, old, or what info is in it, you can use the 'openssl' command with the 509 option to get you more info on a certificate, eg: Create a private key and certificate-signing request (CSR) for the localhost certificate.