Hello all,
we were running a letsencrypt certificate on a server that used to me signed by the intermediate "Letsencrypt Certificate Authority X3". A number of machines "in the field" were doing certificate pinning to the old certificate chain.
Apparently an update between 2020-12-20 and 2021-01-03 changed the intermediate from "Letsencrypt Certificate Authority X3" to "R3" and now those machines refuse to talk to our server.
Is there a way to get a certificate issued which uses the "Letsencrypt Certificate Authority X3" as the intermediate certification authority?
Thanks,
Christian.