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In today’s digital landscape, the importance of secure and efficient data ingestion cannot be overstated. This is particularly true for Microsoft Sentinel, a cloud-native Security Information and Event Management (SIEM) solution, which relies on data connectors to gather logs from various sources.
However, issues may arise during the configuration or operation of these data connectors, leading to missing or incomplete log data. To help you navigate these challenges, we’ve compiled a guide for SOC analysts and security engineers managing Sentinel data ingestion.
Common Data Connector Configuration Mistakes
Before diving into connector-specific troubleshooting, it’s essential to understand common misconfigurations that can lead to data connector failures. Ensure you have a solid foundation by verifying each data connector status in Sentinel > Data connectors page.
Service Principal and Permission Requirements
For some data connectors, the service principal responsible for accessing the data source must be correctly configured with adequate permissions. For instance, the Entra ID logs require diagnostic settings to be configured to send to the Log Analytics workspace.
Validating Data Flow with KQL Heartbeat Queries
Test data ingestion by running KQL queries like `SigninLogs | take 10` or `DeviceEvents | take 10` to confirm data arrival. These simple queries can help you verify that your data connectors are functioning correctly.
Cost Implications of High-Volume Connectors
As your organization grows, so does the volume of data generated by various services. Be mindful of the cost implications when enabling high-volume connectors, as excessive data can lead to increased Log Analytics workspace storage costs.
Connector-Specific Troubleshooting (Entra ID, MDE, Office 365)
– Entra ID logs: Ensure diagnostic settings are configured to send to the Log Analytics workspace.
– MDE connector: The Defender XDR-Sentinel integration needs explicit enablement.
– Office 365 connector: Remember that this connector only ingests SharePoint, Exchange, and Teams audit logs, not all Office 365 services.
Monitoring Billing Impact via Usage and Estimated Costs Blade
Keep an eye on your billing impact by monitoring the Usage and estimated costs blade in the Log Analytics workspace. This will help you manage your expenses effectively.
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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 →