Troubleshoot Expired Server Certificates (Strata Cloud Manager)

1. Filter the decryption logs for expired certificates.

   1. Select Log Viewer, and then select Firewall/Decryption.
   2. In the search field, enter the query Error Message = ‘Expired server certificate’.

      This query identifies servers that generate Expired server certificate errors. The NGFW blocks access to these servers because of the expired certificate.
2. (Optional) Double-check the certificate expiration date at the Qualys SSL Labs site.

   Enter the hostname of the server (Server Name Identification column of the decryption log) in the Hostname field and Submit it to view certificate information for the host.
3. Filter the decryption logs for certificates that expire soon.

   1. Select Log Viewer, and then select Firewall/Decryption.
   2. In the search field, enter a query to find upcoming certificate end dates:

      Use the Time Not After parameter with a future date, for example, Time Not After <=‘2020-01-01’.

      Example: Suppose today’s date is December 1, 2024, and you want to give yourself two months to evaluate and prepare in case sites don’t update their certificates, search for certificates that expire by February 1, 2025 (Time Not After <=‘2025-02-01’)).

      To see the exact date on which a certificate expires, look at the Certificate End Date column in the logs.
4. Determine the action to take for sites with expired certificates.

   • If you don’t need to access the site for business purposes, the safest action is to continue to block access to the site.
   • If you need to access the site for business purposes, take one of the following actions:
     • Contact the administrator of the site with the expired certificate and notify them that they need to update or renew their certificate.
     • Create a decryption policy rule that targets business-critical sites with expired certificates and a decryption profile that allows access to sites with expired certificates. Apply the rule exclusively to business-critical sites. As sites update their certificates, promptly remove them from the rule.