Before registering Apex One to the Apex Central server, you must first obtain the Apex Central certificate file from the Apex Central server from the following location:
<Apex Central installation folder>\Certificate\CA\TMCM_CA_Cert.pem
Apex One and Apex Central use the certificate and public key encryption to ensure that only authorized registration and policy management communication occurs between the servers. If either server detects unauthorized communication, the server rejects any registration or policy settings being received.
Important:
If your company uses a customized certificate on the Apex Central server, you must upload the Root CA certificate during the Apex Central registration.