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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.

Warning messages

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Outdated Outdated software may result in a non-optimal experience Sensor version is outdated Upgrade your sensor software to the latest version to use the most recently available Defender for IoT features.

Healthy messages

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.

Next steps

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