Try to look at server and agent log files:
Server:
Files: server.log, wrapper.log, bootstrap.log
Location: …<server installation path>/logs
Example: /home/hyperic/server-4.6.6.BUILD-SNAPSHOT-EE/logs
Agent:
File: agent.log
Location: …<agent installation path>/logs
Example: /home/hyperic/agent-4.6.6.BUILD-SNAPSHOT-EE/log
Thanks,
Tal