Spotlight’s ability to function, to collect and display data, may depend on account permissions granted over the network and specific open network ports.
See Network Ports
Spotlight diagnostic user groups
Spotlight diagnostic user groups are Windows groups created on install of Spotlight. Spotlight uses these groups to authenticate Spotlight Client access to the Spotlight Diagnostic Server. Membership of these groups affects the Spotlight Client’s ability to configure Spotlight and run actions on monitored Windows Server and SQL Server instances.
The Spotlight Diagnostic Server uses WMI queries to retrieve performance counter information from Windows server hosts. Verify WMI is working and returns data properly.
How to limit the number of ports used by WMI
In order to effectively use WMI between fire walled hosts, you can limit the number of ports used by the DCOM subsystem and only open those ports.