ACM Private CA now supports the Online Certificate Status Protocol (OCSP)

AWS Certificate Manager (ACM) Private Certificate Authority (CA) announces the availability of Online Certificate Status Protocol (OCSP) for distributing certificate revocation information. When establishing an encrypted TLS connection, endpoints can use OCSP to query, in near real time, if a certificate has been revoked. Thus alerting the endpoint that the certificate should not be trusted. This feature provides a fully managed OCSP solution for notifying endpoints that certificates have been revoked without the need to manage or operate infrastructure themselves. 

Source:: Amazon AWS