All systems are shut down for patching and then restarted.
After restart, the Data Collector (DC) does not start/reconnect to the Data Aggregator (DA).
The DA must be running before the DC’s start because the DC will make a registration call to the DA and if there is no answer it cannot start.
Release : 3.6
Component : IM Polling
Make sure the DA is fully started before starting the DC’s