SAP Host Agent Troubleshooting:
http://scn.sap.com/docs/DOC-342171862333 - Common Host Agent issues displayed in Agent Administration
http://service.sap.com/sap/support/notes/1862333Host Agent Automatic Upgrade
- Unpack newer agent to /usr/sap/hostctrl/new
- Host agent checks the location every 5 minutes (by default) and upgrades the agent if necessary
