Hey everyone, I'm hoping someone can help me debug a weird MDE issue I'm seeing in our test environment. I'm still pretty new to managing this tool, so I might be missing something obvious.
Our Defender for Endpoint agent on a Windows Server 2022 machine shows as **'Active'** in the Microsoft 365 Defender portal. However, the device hasn't submitted any alerts or sensor data in over 48 hours. The last communication timestamp is stale. I ran the agent's connectivity test script, and it passed all checks for internet connectivity and service URLs.
When I check locally on the server, the `SenseIR` service is running. I also ran a quick PowerShell command to check the agent health:
```powershell
Get-Service SenseIR
Get-MpComputerStatus
```
The output shows the service is running and Defender Antivirus is active. But I'm not sure what to check next. Has anyone run into this "active but silent" state before?
What are the key logs or registry values I should be looking at to figure out why data isn't flowing to the portal? Could it be a sensor reset issue even though the portal says active? Any pointers would be super helpful as I try to learn the troubleshooting steps for this.