FireDaemon Certify One SSL / TLS Certificate Checker

FireDaemon Certify One is a software program designed to help you inspect, audit, and report on SSL / TLS certificates and certificate chain validity

Web browsers and devices in general have become much stricter in regard to handling SSL / TLS certificates. All major browsers will warn or block access to sites where the SSL / TLS certificate or certificate chain is invalid. Certificate lifespans have been reduced. Hence, it's important to be able to audit and report on certificate validity to ensure the certificate chain is intact and test whether certificates have been revoked or expired. Similarly, access may be blocked to a website if the certificate chain of trust (i.e. all certificates including the root CA certificate and any intermediate certificates) is incomplete, misordered, revoked, or expired. FireDaemon Certify One gives you the ability to:

  • Scan all endpoints of a specific host
  • View graphical reports on the Dashboard
  • Quickly see expiring SSL / TLS certificates
  • Quickly discover failing SSL / TLS certificates or hosts
  • Easily see SSL / TLS renegotiation failures and other handshake warnings
  • Easily view the SSL / TLS certificate chain for a host
  • View the properties of an established SSL / TLS connection
  • View the DNS queries and record types involved in resolving host names
  • Schedule automatic scans of your hosts daily or weekly
  • Receive a scan report in your inbox
  • Query CAA DNS records.

FireDaemon Certify One Dashboard

FireDaemon Certify One can assist you in meeting specific cybersecurity control compliance requirements contained within various cybersecurity frameworks including:

  1. Annex A.10 in ISO/IEC 27001:2022
  2. SC-8 in NIST SP 800-53 R.5
  3. DS-15.5 in the Motion Picture Association's (MPA) Content Security Best Practices v4.10
  4. TS-29 in the Motion Picture Association's (MPA) Content Security Best Practices v5.0.

Certify One consumes the FireDaemon OpenSSL Binary Distribution, FireDaemon Synkronize Task Scheduling Library and SQLite ORM which we directly contribute code.


FireDaemon Certify One 4.0.6

January 2023 - 30-day trial

For Microsoft Windows


Purchase a License

Please follow this link to purchase a license.


Once you have downloaded the installer, double-click the installer and follow the installation instructions.

Using FireDaemon Certify One

Step 1: Setup Scan Targets and Scheduling

First off, populate the list of Scan Targets. Then click the "Scan All" button. You can also Schedule scans to run automatically. You can test Certify One with valid, expired, and revoked certificates via or

FireDaemon Certify One Scan Targets and Scheduling

Review Scan Log

If you hover over any scanned host, you will see a Scan Log icon. Click on the Scan Log to display the Scan Log dialog which contains scan information.

Certify One Scan Log Dialog

View Graphical Reports on the Dashboard

You will be able to see a graphical summary of scan results on the Dashboard once the scans have been completed.

FireDaemon Certify One Dashboard

If click on the graph elements you will be provided with a filtered view of the Scan Targets. The screenshot below provides an example, showing scan targets where the certificate issuer is Let's Encrypt.

Email Reports

If you click on the hamburger menu (to the right of the Certify One logo) you can open the Options dialog. In the Options dialog you can set up notification settings, so every time a scan is run Certify One will send you an email-based report. Here's the Options menu:

FireDaemon Certify One Notification Settings Dialog

You should then receive an email-based report similar to below:

FireDaemon Certify One Scan Email Report Example

Querying CAA Records

You can also query DNS CAA records via the command line! For example:

FireDaemon Certify One CAA Record Name Resolution

Bugs? Issues? Feature Requests?

We are actively developing Certify One. Tell us what you think! Let us know what features you would like to see in the product. All feedback is gratefully received!