A “no data” message is displayed in NetFlow charts.

Comprehensive and Detailed Explanation From Exact Extract:

A "no data" message in NetFlow charts usually indicates that the flow collector service is not receiving or processing flow data. One of the primary troubleshooting steps recommended in the SolarWinds documentation is to restart the collector service. This resolves issues caused by service interruptions, memory leaks, or flow processing errors.

The documentation states:

"If NetFlow charts display 'no data,' verify that the NetFlow collector service is running. Restart the collector service if necessary, as service interruptions can cause a lack of flow data display."