When setting up Microsoft Entra Connect Sync, the main job is to keep user accounts in sync between on-premises Active Directory Domain Services (AD DS) and Azure Active Directory (Azure AD). This creates a hybrid identity system where users can sign in with the same credentials in both places. The setup involves choosing which sync features to use, customizing what gets synchronized, and watching for problems.
The first major decision is which authentication method works best for the organization. Password hash synchronization takes user passwords from the on-premises AD, hashes them, and copies them to Azure AD so users can log in directly to cloud apps. Pass-through authentication keeps passwords on-premises and validates them against AD when users sign in, which some organizations prefer for extra control. Federation sets up a trust relationship between AD and Azure AD so users get single sign-on without passwords being stored in the cloud. Each option has different security and complexity tradeoffs, and the choice affects how users experience the login process.
Not every user and group from on-premises AD needs to appear in Azure AD. OU filtering lets administrators choose which organizational units sync, so only relevant users get accounts in the cloud. Attribute mapping controls which details about each user travel between systems, such as phone numbers or department names. Organizations can also add directory extensions to store custom information that standard Azure AD attributes do not cover. These customization options help keep the synchronized data clean and relevant to what the business needs.
Once synchronization is running, administrators need to check that it works correctly. Azure AD Connect Health provides a dashboard showing sync status, error counts, and performance metrics. PowerShell commands like Get-ADSyncConnector let technicians query the current state of sync connectors and spot issues quickly. Setting up alerts for failures and reviewing logs regularly catches problems before users notice them. This ongoing monitoring ensures the hybrid identity system stays reliable and users can always access their resources.
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Microsoft Entra Connect Sync supports password hash synchronization, pass-through authentication, and federation. Password hash synchronization copies hashed passwords from on-premises Active Directory Domain Services (AD DS) to Azure Active Directory (Azure AD), pass-through authentication validates passwords against on-premises AD when users sign in, and federation establishes a trust relationship for single sign-on without storing passwords in the cloud.
Administrators can customize synchronization using organizational unit (OU) filtering to specify which OUs synchronize, attribute mapping to choose which user details transfer, and directory extensions to include custom attributes. These options ensure that only relevant users, groups, and details appear in Azure AD.
Administrators can monitor sync health using Azure AD Connect Health, which provides a dashboard displaying sync status, error counts, and performance metrics. In addition, technicians can run PowerShell commands such as Get-ADSyncConnector to inspect connector states, review logs, and set up failure alerts.
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