u/Budget-Half7493

Hi there,

running into a weird issue with Microsoft Defender for Identity and wondering if anyone else has seen this.

Our v3 sensors stopped working out of nowhere. No obvious errors beforehand, just suddenly no data / no activity coming through from that sensor.

What’s odd:

• We still have two v2 sensors running fine in the same environment
• No configuration changes were made recently (no updates, no policy tweaks, nothing)
• Connectivity and domain controller health look normal from what I can tell

Things I’ve checked so far:

• Basic connectivity (seems OK)
• Defender portal – sensor just shows as inactive

Feels like the v3 sensor just dropped off completely while v2 keeps chugging along without any issues

Has anyone experienced something similar with v3 sensors specifically?
Any known issues, logs I should dig into, or things that tend to break silently?

Thank you 😄

Hi there,

running into a weird issue with Microsoft Defender for Identity and wondering if anyone else has seen this.

Our v3 sensors stopped working out of nowhere. No obvious errors beforehand, just suddenly no data / no activity coming through from that sensor.

What’s odd:

• We still have two v2 sensors running fine in the same environment
• No configuration changes were made recently (no updates, no policy tweaks, nothing)
• Connectivity and domain controller health look normal from what I can tell

Things I’ve checked so far:

• Basic connectivity (seems OK)
• Defender portal – sensor just shows as inactive

Feels like the v3 sensor just dropped off completely while v2 keeps chugging along without any issues

Has anyone experienced something similar with v3 sensors specifically?
Any known issues, logs I should dig into, or things that tend to break silently?

Thank you 😄