• Linux
• OpenSSL

OpenSSL Linux command line ssl tool

• Links security/ssl , easy-rsa , LetsEncrypt

• openssl self signed certificate with keyUsage flags

Verify a web server certificate

• openssl s_client -showcerts -connect my.test.com:443
  • Output should end on "Verify return code: 0 (ok)"
  • As of 2017 the TLS Protocol should be TLSv1.2 at least.

• For sni you can add -servername xyz.test.com