This scenario happens if the Data Aggregator is not able to resolve it's own name.
Data Aggregator installation log shows no errors at all
A manual attempt to start activeMQ, appears to start a pid, but then when checked, the process is found not to be running
Check the /ETC/HOSTS file and make sure that there is an entry for the Data Aggregator, itself, in the Hosts file
192.168.1.100 DataAggregatorName.domain.com DataAggregatorName