Network Management

SolarWinds NTA: NetFlow Data Missing - "Interface index 0... is Managed: False"

This issue in SolarWinds NetFlow Traffic Analyzer (NTA), where NetFlow data isn't showing and the logs indicate an interface with index 0 is Unmanaged, points to NTA rejecting flow data it can't associate with a known, managed interface.

First published date

10/31/2025 5:42 AM

Last published date

6/5/2026 9:22 PM

Overview

NetFlow Traffic Analyzer (NTA) may fail to display NetFlow data on the Summary or other resources, even though the flows are being received by the SolarWinds Platform server.

Product section

Netflow Traffic Analyzer

Cause

NTA is receiving flows where either the Input or Output interface index is reported as 0 (or an index that does not correspond to a discovered/managed interface on the transmitting node). NTA's data processing pipeline discards flows associated with unmanaged interfaces to maintain data integrity and relevance. These flows are not correlated with existing interfaces, so they do not appear in the NTA view.

Resolution

Note: If High Availability (HA) is enabled, it must be disabled globally before proceeding to ensure the main poller's services are fully stopped and the database changes can be made safely.

Step 1: Disable HA (If Enabled)

Disable HA globally from the command prompt of the Primary Poller.
Refer to the SolarWinds Success Center article: Disable HA in the command prompt

Step 2: Stop Services

On the Active Main Poller, stop all SolarWinds services using the SolarWinds Platform Service Manager.

Step 3: Update Database Setting

Open Database Manager from the SolarWinds Platform folder of the start menu.
Select Add Orion Server and expand the SQL server in bold.
Right-click the SolarWindsOrion database and select New Query.
Paste and Execute the following SQL query:
Note: This query sets the configuration to retain flow data from unmanaged interfaces, allowing the index 0 flows to be processed and displayed.

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Update [dbo].[NetFlowGlobalSettings] Set Value ='1' where KeyName ='RetainUnmanagedInterfaceData'

Step 4: Start Services

Start all SolarWinds services using the SolarWinds Platform Service Manager.

If the script does not work and gives an error, go to SETTINGS > All Settings > NTA Settings.

Make sure that you tick on "Allow monitoring of flows from unmanaged interfaces" and then save.

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