Sensor health message reference

This article lists the sensor health messages displayed in the Sites and sensors page in the Azure portal.

For more information, see Understand sensor health.

Critical messages

Title	Message	Description	Recommendation
Disconnected	This sensor isn't communicating with Azure	Sensor is disconnected	Try signing into the sensor to check for errors or networking failures. We also recommend reviewing the sensor networking configuration and verifying the sensor’s ability to communicate with Azure.
Sanity failed	This sensor failed an internal consistency check	Sensor fails sanity	The sensor is in a degraded state. Check the sensor for hardware failures and try restarting the sensor. If the issue isn't resolved, open a support ticket.
No traffic detected	No traffic detected on the monitored network interfaces	No traffic detected	Check that the monitoring ports are connected to SPAN/monitor ports on the adjacent switch and that traffic is active on the link. At least one link with network traffic should be connected to the monitor ports.

Title	Message	Description	Recommendation
Package upload failed	There was an error uploading the file to the sensor	Upload error	Verify the sensor’s ability to communicate with download.microsoft.com and retry. If the problem persists, open a support ticket.
Sensor update failed	There was an error installing the update.	Installation error	Open a support ticket.
Unstable traffic to Azure	Sensor’s connection to Azure is unstable	Unstable traffic to Azure	We recommend that you check the sensor WAN connection, the BW limit settings, and validate network equipment that might be on the route between the sensor and the cloud.
Outdated	Outdated software may result in a non-optimal experience	Sensor version is outdated	Upgrade your sensor software to the latest version to use the most recently available Defender for IoT features.

Title	Message	Description	Recommendation
Pending activation	Waiting for sensor to connect for the first time	Pending activation	Upload the activation file to the sensor. If this doesn't resolve the problem, verify the sensor’s ability to communicate with Azure.
Pending reactivation	Waiting for reactivation with new license	Pending reactivation	Upload the new activation file to the sensor. If this doesn't resolve the problem, verify the sensor’s ability to communicate with Azure.

Remediate each error as recommended. For more information, see Manage sensors with Defender for IoT in the Azure portal.