All Tests within the Exchange Server Health Test Are failing with "The network path was not found. Verify that the server is online."
This can be caused if the Spotlight On Messaging Server is unable Server is unable to create a connection to Performance Monitor on the remote machine.
WorkAround:
Open Perfmon.exe on the Spotlight On Messaging Server, under the context of the Spotlight On Messaging Service account. Try to add performance counters from the remote server.
If this tests fail investigate the error messages to determine any potential network issues that may be blocking this connectiivity.