Secure communication between endpoints and ATP is enabled when the SSL Certificate is installed.
See Configuring secure access to ATP Manager.
ATP uses private APIs to push the protocol settings and port settings to the associated Symantec Endpoint Protection Manager along with ATP's self-signed SSL certificate.
ATP 3.0 and later only sends the currently assigned certificate when your SEPM version is 14 RU 1 or later.
Click on the following link to learn more about the ports that you must open for Symantec Endpoint Protection Manager endpoints to communicate with ATP.
See Required firewall ports.
See About integrating ATP with Symantec Endpoint Protection
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