How to Migrate Azure AD Connect to New Server: A Comprehensive Guide

Microsoft's Azure AD Connect makes it easy for on-premises Active Directory and Azure Active Directory to be in sync with each other. 

It makes sure that users' identities and credentials are the same in both settings, which lets them use single sign-on and other features related to identities. 

Moving Azure AD Connect to a new server is necessary to keep the identity synchronization system running smoothly and reliably. 

It lets businesses improve their hardware, software, or systems while keeping track of users' identities and resource access in a safe way. 

Preparing for Migration

A. Assessing Current Azure AD Connect Configuration

  • Understanding Existing Configurations: Check out how Azure AD Connect is currently set up, including the domain settings, synchronization rules, and any custom settings that were made.
  • Documenting Sync Rules and Filters: To make sure the move to the new server goes smoothly, write down the current synchronization rules and filters.

B. System Requirements for the New Server

  • Hardware Specifications: find out what hardware the new server needs to handle Azure AD Connect. This includes the CPU, memory, and storage space.
  •  Software Prerequisites:Before installing Azure AD Connect on the new server, make sure you have all the relevant software components and dependencies.

Creating a Migration Plan

A. Setting Clear Objectives

  1. Defining Success Criteria: Clearly outline the specific outcomes and achievements that signify a successful migration, such as seamless user access and minimal disruption to operations.
  2. Identifying Potential Challenges: Anticipate and document potential obstacles or issues that may arise during the migration process, such as data inconsistencies or compatibility issues.

B. Establishing a Timeline

  1. Planning Downtime and Impact: Strategically plan for any necessary downtime during the migration process and assess the potential impact on operations to minimize disruptions.
  2. Coordination with Stakeholders: Coordinate with relevant stakeholders to ensure alignment on the migration timeline, minimize conflicts, and address any dependencies or concerns.

Backup and Recovery Strategies

A. Backing Up Azure AD Connect Configuration

  1. Using Azure Backup Tools: Utilize Azure's built-in backup tools to create a comprehensive backup of the Azure AD Connect configuration, ensuring all critical data is securely stored.
  2. Verifying Backup Integrity: Perform regular checks to validate the integrity and completeness of the backed-up Azure AD Connect configuration data.

B. Testing the Recovery Process

  1. Simulating Server Failures: Conduct simulated server failure scenarios to test the effectiveness of the recovery process and identify any potential vulnerabilities or gaps.
  2. Ensuring Data Consistency: Verify the consistency and accuracy of the recovered data to ensure that all critical information is successfully restored during the recovery process.

Installing Azure AD Connect on the New Server

Backing Up Azure AD Connect Configuration

  1. Using Azure Backup Tools: Employ Azure's native backup tools to create a comprehensive backup of the Azure AD Connect configuration, ensuring secure storage of critical data.
  2. Verifying Backup Integrity: Regularly validate the integrity and completeness of the backed-up Azure AD Connect configuration data.

B. Testing the Recovery Process

  1. Simulating Server Failures: Perform simulated server failure scenarios to assess the effectiveness of the recovery process and identify potential vulnerabilities or gaps.
  2. Ensuring Data Consistency: Check the recovered data to make sure it is consistent and correct. This will help make sure that all important data is retrieved successfully during the recovery process.

Data Migration Strategies

A. Planning for User and Group Migration

  1. Strategies for Large User Bases: Employ batch migration techniques, prioritize user groups, and consider parallel migration processes to efficiently handle large user bases.
  2. Handling Security Groups and Permissions: Carefully map and migrate security groups and permissions to ensure seamless access and minimal disruption to user roles and permissions.

B. Handling Attribute Mapping

  1. Ensuring Consistency in Attribute Mapping: Verify consistent mapping of attributes between the source and target systems to maintain data integrity and accuracy throughout the migration process.
  2. Resolving Conflicts: Proactively identify and resolve any attribute mapping conflicts or discrepancies to prevent data loss or inconsistencies during the migration.

Decommissioning the Old Server

A. Ensuring Data Synchronization

  • Verifying Successful Migration: Validate that all data has been successfully synchronized to the new server and perform thorough checks to ensure data integrity.
  • Addressing Last-Minute Changes: Accommodate any final adjustments or data updates before finalizing the decommissioning process of the old server.

B. Disabling and Uninstalling Azure AD Connect on the Old Server

Disabling and uninstalling Azure AD Connect on an old server involves a series of steps to ensure a smooth decommissioning process.

Below is a step-by-step guide, including the decommissioning process and monitoring for lingering issues:

C. Step-by-Step Decommissioning Process:

  1. 1

    Document Configuration:

     Before starting the decommissioning process, document the current Azure AD Connect configuration, including synchronization settings, custom configurations, and any specific rules.

  2. 2

    Verify Replication Status:

    Ensure that the Azure AD Connect server is in sync with Azure AD and on-premises Active Directory. You can use the following PowerShell command to check the synchronization status:


       Get-ADSyncConnector | Select-Object DisplayName, State


  3. 3

    Stop Synchronization Service:

     Open the Synchronization Service Manager on the server, stop the synchronization service, and disable it from starting automatically.

  4. 4

    Remove Sync Rules:

     Remove any custom synchronization rules you may have created. Open the Synchronization Service Manager, navigate to "Connectors," and delete any custom connectors.

  5. 5

    Uninstall Azure AD Connect:

    Use the following steps to uninstall Azure AD Connect:

    • Open "Add or Remove Programs" on the server.

    •  Locate and select "Microsoft Azure AD Connect."

    •  Click "Uninstall" and follow the wizard to complete the uninstallation.

  6. 6

    Confirm Deletion of Connector Spaces:

     After uninstallation, confirm that the connector spaces are deleted. These spaces are typically found in the `%ProgramData%\AADConnect\` directory.

  7. 7

    Clean Up AD Connect Objects:

     Remove any objects created by Azure AD Connect in Active Directory, such as service accounts. Ensure these deletions do not impact other applications.

  8. 8

    Remove Azure AD Connect Server from Azure Portal:

    In the Azure portal, navigate to Azure AD > Azure AD Connect. Remove the old server from the list of registered servers.

  9. 9

    Decommission Server:

    If the server is being decommissioned entirely, follow your organization's server decommissioning process.

D. Monitoring for Lingering Issues:

  1. 1

    Event Logs:

     Check the event logs on both the Azure AD Connect server and the domain controllers for any errors or warnings related to directory synchronization.

  2. 2

    Azure AD Connect Health:

    If you have Azure AD Connect Health configured, monitor the health status to ensure there are no reported issues. The Azure portal provides insights into synchronization health.

  3. 3

    Active Directory Replication:

    Monitor Active Directory replication to ensure that changes made during the decommissioning process are replicated correctly.

  4. 4

    User Sign-In:

     Monitor user sign-ins to verify that users can authenticate without issues after decommissioning Azure AD Connect.

  5. 5


    Conduct thorough testing to ensure that user attributes are no longer synchronized, and users can perform their usual activities without disruptions.

  6. 6

    Clean Up DNS Records:

    If the decommissioned server has specific DNS records, ensure they are removed or updated accordingly.

  7. 7

    Backup and Rollback Plan:

    Before starting the decommissioning process, ensure you have a backup and a rollback plan in case any issues arise during the process.

By following these steps and monitoring for lingering issues, you can safely disable and uninstall Azure AD Connect on the old server. Always perform these actions during a maintenance window to minimize the impact on users and applications.

Post-Migration Validation

A. Verifying User Access and Authentication

  • Testing User Logins: Conduct thorough testing of user logins on the new server to ensure seamless access and authentication functionality.
  • Addressing Authentication Challenges: Promptly identify and address any authentication challenges or issues that may arise during the verification process.

B. Monitoring Sync Performance

  • Utilizing Azure AD Connect Health: Leverage Azure AD Connect Health to monitor and analyze the synchronization performance, identify potential issues, and ensure the health of the synchronization process.
  • Resolving Sync Errors: Actively look for and fix any synchronization problems or mistakes to maintain data integrity and consistency across all systems.

Common Issues and Troubleshooting

  • Handling migration failures: 

    Involves identifying root causes, implementing corrective measures, and ensuring minimal impact on data integrity and user access.

  • Identifying common pitfalls: 

    Enables proactive mitigation of potential challenges, ensuring a smoother migration process, and reducing disruptions.

  • Troubleshooting error messages: 

    Requires thorough analysis, error identification, and systematic resolution to maintain the integrity of the migration process.

  • Resolving authentication and authorization problems: 

    Involves verifying credentials, permissions, and configurations to ensure secure and seamless access for users.

  • Dealing with access denied issues: 

    Necessitates reviewing permissions, user roles, and security settings to address and rectify access restrictions effectively.

  • Reconfiguring permissions:

    involves adjusting user access rights, roles, and privileges to align with the new server environment and maintain data security and integrity.


The detailed guide on moving Azure AD Connect to a new computer stresses how important it is to test, confirm, and carefully plan.

It talks about important steps, like figuring out the current setup and making sure everything is okay after the transfer. 

It stresses how important it is to have backup plans, move data, and shut down the old server. The guide also talks about common problems and how to fix them, which makes sure the change goes smoothly and safely.


It is very important to test and confirm that moving Azure AD Connect to a new computer goes well.

Organizations should make testing user logins, security challenges, and keeping an eye on synchronization speed with Azure AD Connect Health a top priority.

Also, it's important to take the initiative to fix common problems like failed migrations, error messages, and limited access.

Resources for ongoing management after migration should be used to make sure that Azure AD Connect processes stay safe and efficient.

About the author


Youssef is a Senior Cloud Consultant & Founder of

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