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Comprehensive and Detailed Explanation From Exact Extract:

If a node remains in “unknown” status:

A. Ping device from assigned polling engine: Verifies direct network connectivity from the poller to the node.

C. Verify the appropriate polling method is set for this node: Ensures SolarWinds uses the correct protocol (ICMP, SNMP, WMI, etc.) for monitoring.

D. Verify a ping response for this node is received through the ICMP: Confirms basic reachability and that the node is not blocking ping requests.

Running an SNMP walk (B) can help diagnose SNMP-specific issues but is not always directly relevant to a node simply being in “unknown” status unless SNMP is the configured polling method.

Comprehensive and Detailed Explanation From Exact Extract:

To detect duplex mismatches:

The node must be monitored (i.e., managed in SolarWinds).

The node must be in "up" status, so SNMP data about interface status, speed, and errors can be polled and compared.

Description in MIB (A) is not necessary if the device is already SNMP-capable, and "warning" status (C) is a result, not a requirement.

Comprehensive and Detailed Explanation From Exact Extract:

If logs are not being sent from a Windows agent, you must confirm that the log forwarding feature is enabled. Even if the agent is installed, logs will not be transmitted unless this setting is turned on.

The documentation notes:

"Ensure the agent is configured to forward logs. Log forwarding must be enabled for the agent to transmit log data to the SolarWinds platform."

Comprehensive and Detailed Explanation From Exact Extract:

Device Studio in SolarWinds allows you to build custom pollers for several device-level metrics. According to the SolarWinds Administrator Guide:

Device Studio can be used to create pollers for multi-CPU/memory, single CPU/memory, and VLAN details. These templates allow you to monitor resource usage and VLAN assignments.

"You can build templates for node details, but those are standard node properties, not supported by Device Studio pollers."

Comprehensive and Detailed Explanation From Exact Extract:

Resource is showing outdated information: If polling intervals are too long or if there is a communication problem, the hardware health resource may not update promptly, resulting in inaccurate status display.

Wrong MIB being used for polling: If SolarWinds is using an incorrect or generic MIB, it may not retrieve accurate hardware health data for the specific fan sensor, causing the status to incorrectly display as “up” even when failed.

While disabled sensors and forced thresholds may impact alerting or monitoring, they are less likely to cause this direct display inconsistency.

Comprehensive and Detailed Explanation From Exact Extract:

The Universal Device Poller (UnDP) allows administrators to define custom SNMP OIDs for statistics (like UPS battery status) that are not natively polled. You can assign a new UnDP to an existing node to monitor additional values such as UPS battery status, provided the device supports the necessary OID.

Comprehensive and Detailed Explanation From Exact Extract:

Device Studio supports advanced custom polling, allowing you to build pollers for technologies such as multi-CPU/memory, node details (e.g., chassis, serial number), and single CPU/memory. While interface traffic polling is best accomplished through standard interface resources, Device Studio is designed for more advanced or complex device metrics that are not available via built-in polling.

Ping the device from the polling engine: Verifies network connectivity and correct polling engine assignment.

Verify hardware health sensors: Ensures the platform is receiving valid sensor data; missing data may indicate sensor or device communication issues.

Adding a remote site node and waiting are not direct troubleshooting steps for missing data on a node that is already “up.”

Exact Extract from Official Guide:

“If a node is up but data is missing, check network connectivity from the polling engine using ping or SNMP walk tools, and verify that hardware health sensors are reporting valid data.”

— (Network Performance Monitor Administrator Guide, “Troubleshooting Nodes and Data Collection” section)

Comprehensive and Detailed Explanation From Exact Extract:

Device Studio is designed to enable support for complex devices and can poll multiple OIDs as part of a single custom poller definition. While Universal Device Poller (UDP) is also used for custom SNMP polling, it is generally limited to a single OID per poller. Device Studio is intended for use cases that require combining and correlating multiple OIDs for richer, template-based device monitoring.

Comprehensive and Detailed Explanation From Exact Extract:

To add additional NetFlow collector ports, you must stop the NetFlow service and then specify multiple ports separated by commas in the NetFlow collector services widget.

From the documentation:

"To configure multiple collector ports, stop the NetFlow service, edit the collector ports in the widget by separating them with commas, and then restart the service."