On a normal day, all of a sudden my primary poller will stop showing any status for its CPU/Memory/Health Application/Polling Health monitor/IIS etc. I opened a case and there is not much of progress. Tried resetting the remote registry service, adding the registry entry by following a document from one of the thwack forums for the unknown application issue, tried restarting the server/services. No improvements yet, we were running the polling through WMI and moved to Agent based for all pollers recently. But this issue is not necessarily after we moved to agents as the polling/monitoring was working fine for more than 2 weeks on agents. What happens if I delete my main poller from nodes list and re-add it back. What happens to the polling elements assigned to it? Is there any other way we can try resolve this from any of your experiences before?