An interesting problem solved by a simple solution. When renewing the SubCA certificate for an Active Directory Certificate Authority and clicking through the ‘Renew CA Certificate…’ prompt after being asked if you want to keep the current private key or not the CA service simply restarts without displaying the usual CA Certificate Request prompt (as above).
The solution – a simple backup and restore of the CA in it’s current state sorted it. Very much feels like a bug, no clear/obvious error message in any event logs.
Original solution from – https://learn.microsoft.com/en-us/answers/questions/2198113/cannot-renew-subordinate-ca-certificate-error-0x80.