Check Diagnostics server log file and Health View.
Ping from Diagnostics server to probe by “registered name”.
–Try setting the /etc/dispatcher.properties registered_hostname=
–Try to open probe URL /profiler/metrics?xml=true from the Diagnostics server.
–If multi-NIC, check network routing and if need set a static route.
Check time zone on probe and server.
–Make sure when converted to UTC/GMT time is rational.
If server side aggregation
–Telnet to mediator at port 2612 from probe.
•Check mediator name specific in /etc/dynamic.properties can be resolved mediator.host.name=
If probe side aggregation
–Switch probe to server side aggregation in /etc/dispatcher.properties, enable.probe.aggregation = false