By default we have a self-signed certificates (RADIUS/HTTPS) installed on ClearPass. It has a expiration date and say if the self-signed cert/s on your ClearPass is/are about to expire, how to renew it?
In order to renew/install a self-signed cert (RADIUS/HTTPS) on ClearPass, navigate to the following location:
CPPM > Administration > Certificates > Server Certificates > Create Self-Signed Certificates
Post clicking on "Create Self-Signed Certificates", fill in the details of the certificate and click on "Submit".
Verify the certificate details and then click on the "Install" button, to renew/install the cert.