Sun Java Enterprise System 5 Update 1 Release Notes

Unsynchronized clocks prevent adding a host to the Monitoring Console (6487357)

If the time on the node agent and master agent hosts is too far out of sync, adding that node in the Monitoring Console will fail. The error log of the master agent's Monitoring Framework will report a severe error “during JRMP connection establishment.”

Solution Set the time on either host so they are synchronous.