How to monitor SSL certificates

Learn how to monitor the expiry date of an SSL certificates with a customer threshold

Step 1 - Add the check

Go to the host and add the check "SSL Cert. Check". Wait a couple of minutes and go to "Latest Data" of the host. Verify the remaining days of the certificates appear on the list of measurements.
Remaining days of the certificate

Step 2 - Create the rule

On the main menu on the left side, go to "Rules" and add a new rule.
  • For "Host", select is and select the host the SSL certificate check runs on.
  • For "Type", select Service check and Or manually specify check key
  • Enter net.tcp.ssl.443.expiryDaysRemaining as check key.
  • For the condition enter for example last value is less than 20. This will create an alert, if the certificate expires within 20 days or earlier.
Rule with a custom threshold