# noflow **Explanation** The noflow NDM is a system NDM that fires when no flow is being received by Netography from a configured flow source. **What to Look For** This condition most likely means that the device that was configured to send flows is down. As such, it may indicate a serious condition such as a network outage. In some cases, the event may fire because the configuration of the device has changed, such that it can no longer send flows to Netography. Also, a change in network architecture or firewall policy might be preventing flows from the device from reaching Netography. In some cases, the event merely occurs because no network traffic is occurring at the source network, and so there are no flows for the device to report, but most networks have some activity all of the time. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.fusion.vectra.ai/detection-models/library/system/noflow.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.