Look at the server’s log.nsf, misc events view, to see whether there are messages displayed about the agent.
If you still have a problem, please describe it in more detail. There are many different ways an agent can fail.
Andre Guirard, IBM/Lotus Development
Useful blog: Best Practice Makes Perfect
NOTE: My policy is to post only two responses to the same question. So that my second response can solve your problem rather than being a request for details, please read the C R I S P Y document.