Andreas Hartig 12/1/2025

Azure Arc – Secure a Tier 0 resource – 2025

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This technical article discusses securing Tier 0 assets (like domain controllers and identity systems) in a hybrid, cloud-native era. It argues that legacy ESAE architectures are insufficient and details a modern strategy using Azure Arc. The article covers treating Arc-connected servers as Tier 0, implementing dedicated subscriptions, tightened controls, and shifting to detection-first strategies and Entra-joined devices as per modern Microsoft guidance.

Azure Arc – Secure a Tier 0 resource – 2025

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