Juniper ATP Cloud is a cloud-based service that provides advanced threat prevention and detection for SRX Series devices. To enroll an SRX Series device with Juniper ATP Cloud, you need to have a valid license and authorization code, and you need to run a Junos OS op script on the device. The op script performs the following tasks:
Downloads and installs certificate authority (CA) licenses onto your SRX Series device.
Creates local certificates and enrolls them with the cloud server.
Performs basic Juniper ATP Cloud configuration on the SRX Series device.
Establishes a secure connection to the cloud server.
You can run the op script either by copying the CLI command from the Juniper ATP Cloud Web Portal and running it on the device, or by using the enroll command on the device. The op script is the only way to enroll an SRX Series device with Juniper ATP Cloud. You cannot enroll the device manually or by using other methods.
The other statements in the question are incorrect for the following reasons:
If a device is already enrolled in a realm and you enroll it in a new realm, none of the device data or configuration information is propagated to the new realm. This includes history, infected hosts feeds, logging, API tokens, and administrator accounts. You can view and change the realm association of a device from the Realm Management page in the Juniper ATP Cloud Web Portal.
The only way to enroll an SRX Series device is not to interact with the Juniper ATP Cloud Web Portal. You can also use the enroll command on the device, which performs all the necessary enrollment steps without requiring you to access the Web Portal.
When the license expires, the SRX Series device is not disenrolled from Juniper ATP Cloud without a grace period. The device enters a grace period of 30 days, during which it can still send files to the cloud for inspection and receive threat intelligence feeds. After the grace period, the device is disenrolled and stops communicating with the cloud.
References:
How to Enroll Your SRX Series Firewalls in Juniper Advanced Threat Prevention (ATP) Cloud Using Policy Enforcer
Enroll an SRX Series Firewall using Juniper ATP Cloud Web Portal
ATP Cloud | Step 2: Up and Running
Enroll an SRX Series Firewall Using the CLI
