Cloud Sync prerequisites
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Microsoft's commit message in MicrosoftDocs/entra-docs · commit 20099ac · +8 −1 lines · also on GitHub
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description: This article describes the prerequisites and hardware requirements you need for cloud sync.
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ms.topic: how-to
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−ms.date: 07/27/2026
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+ms.date: 10/22/2026
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ms.subservice: hybrid-cloud-sync
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+ms.custom: msecd-doc-authoring-1030
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---
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# Prerequisites for Microsoft Entra Cloud Sync
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- High availability refers to the Microsoft Entra Cloud Sync's ability to operate continuously without failure for a long time. By having multiple active agents installed and running, Microsoft Entra Cloud Sync can continue to function even if one agent should fail. Microsoft recommends having 3 active agents installed for high availability.
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- On-premises firewall configurations.
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+### Active Directory site configuration
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+The Microsoft Entra provisioning agent uses standard Active Directory domain controller discovery mechanisms. Incorrect DNS configuration, subnet-to-site mappings, or site configuration can cause synchronization failures, performance issues, or intermittent connectivity problems.
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+Ensure that servers hosting provisioning agents are in correctly defined Active Directory sites. In **Active Directory Sites and Services**, associate each server's IP subnet with the appropriate site. Proper site and DNS configuration helps the agent discover appropriate domain controllers and can improve synchronization reliability and performance.
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## Harden your Microsoft Entra provisioning agent server
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