> For the complete documentation index, see [llms.txt](https://docs.fusion.vectra.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fusion.vectra.ai/detection-models/library/system/noflow.md). # 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 This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://docs.fusion.vectra.ai/detection-models/library/system/noflow.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.