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Security admins managing Active Directory often encounter issues with Microsoft Defender for Identity (MDI) sensors stopping data transmission. In this blog post, we’ll explore common reasons behind these sensor failures and provide step-by-step solutions to resolve them.
Common Reasons for MDI Sensors Stopping Data Transmission
- Network connectivity problems
- Sensor deployment issues on domain controllers (DCs)
- Configuration mistakes in the Defender portal
Verifying MDI Sensor Health in the Defender Portal
Begin by checking sensor health within the Microsoft Defender portal. You can access this information through the ‘Endpoint managers’ tab, under ‘Endpoint security’.
Fixing Sensor Connectivity Issues to the MDI Cloud Service
Inspect network connectivity between the affected DCs and the MDI cloud service. Ensure that the necessary ports are open and firewall rules allow traffic flow.
Re-deploying MDI Sensors on Affected Domain Controllers
If connectivity issues persist, consider re-deploying MDI sensors on the problematic DCs. You can do this using Group Policy Objects (GPOs) or PowerShell scripts.
Validating MDI Alert Coverage with Test Attacks
Finally, test the effectiveness of your MDI configuration by simulating attacks on your Active Directory. This helps ensure that your sensors are capturing and reporting relevant alerts.
Conclusion:
By following these steps, you can efficiently troubleshoot and resolve missing alerts and sensor issues in Microsoft Defender for Identity (MDI). Improve the security of your Active Directory with our practical guide. For comprehensive training on MDI and other cloud security solutions, visit our course page: Microsoft Cloud Security Training
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Written by Mohammed Akhter
Founder of ITP Training. 50,000+ students trained across 30+ countries in Microsoft endpoint and cloud security. Learn more →