Certificate expiry query

What happens if a cert expires in Fastly ?
a. Will the client get expired cert ? If yes, for how long ( days, week ) ?
b. Will a default cert be served from platform? If yes, what will be the hostname for it ?

Hey @sankalp.namasthe – if a cert is approaching expiration, we’ll send reminder emails for several weeks leading up to expiration with steps to re-verify the records. If the certificate ultimately expires, the client will receive an expired certificate notice.