Some configuration changes to a Microsoft Certification Authority require the CA service to be restarted. During this restart, the Certification Authority is temporarily unavailable.
This can be relevant in environments where the CA is frequently used or where configuration changes must be performed during normal business operations.
Modern PKI platforms can provide more flexible approaches to configuration and high availability, such as redundant components and deployment models that reduce the impact of maintenance activities.
This can help improve the availability and operational flexibility of certificate services.