Explanation
Juniper Identity Management Service (JIMS) is a service that collects and maintains a large database of user, device, and group information from identity sources, enabling SRX Series Service Gateways to rapidly identify users in a large, distributed enterprise1. JIMS supports the following identity sources: Microsoft Active Directory on Windows Server 2008 R2 and later, and Microsoft Exchange Server 2010 with Service Pack 3 (SP3) and later2. JIMS collects username and device IP addresses from these sources by monitoring the event logs of the Active Directory domain controllers and the Exchange servers3. JIMS does not use DNS or OpenLDAP service ports as identity sources. References:
Juniper Identity Management Service User Guide, Introduction section
Supported Identity Sources, Juniper Identity Management Service 1.6.0 Release Notes Configure Juniper Identity Management Service to Obtain User Identity Information, Junos OS Security Configuration Guide