After performing the procedure described in KB-15880 (HOW TO: Renew expired "APLOS" and "PRISMSERVICE" certificates where the last Prism Central upgrade is over two years old), we enabled CMSP (Microservices Infrastructure).
After enabling CMSP, we were no longer able to access Prism Central.
The following error message is displayed when accessing the Prism Central web console:
"upstream connect error or disconnect/reset before headers. reset reason: connection failure"
SSH access to the Prism Central VM is available, and there are no issues with the cluster status. All services appear to be running normally.