Certwatch warning does not contain path

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I have started receiving warnings about expired certificates from the daily cron-run certwatch script. The warnings come from the section certificates in the database. Three certificates have expired, and for each of them, certwatch provides only the nickname of the certificate:

################# SSL Certificate Warning ################

Certificate for hostname 'Certificate Shack', in file (or by nickname): cacert

The certificate needs to be renewed; this can be done using the 'genkey' program.

Browsers will not be able to correctly connect to this web site using SSL until the certificate is renewed.

##########################################################

There is not a single file in the system with the name cacert, so the certificate is stored in some other container than a file by that name. How do I regenerate the certificate, who uses it, and how do I make certwatch give me paths?

Thank you.