Upgrading or migrating Active Directory to a newer Windows Server platform is a critical milestone for any enterprise IT infrastructure. A well-structured Active Directory Migration Readiness Assessment for Windows Server 2025 ensures that your environment is secure, stable, and fully compatible before introducing new domain controllers or performing schema and functional level changes.
This assessment focuses on identifying configuration issues, health problems, and legacy dependencies that may impact the success of an Active Directory migration project. By performing a structured pre-check, organizations can reduce downtime, prevent authentication failures, and ensure a smooth transition to Windows Server 2025.
Why Active Directory Migration Readiness Matters
Active Directory is the backbone of enterprise identity and access management. Any instability during migration can lead to
Authentication failures across the organization
Replication inconsistencies between Domain Controllers
DNS resolution issues affecting critical services
Kerberos authentication breakdowns
Group Policy failures impacting endpoints
A readiness assessment helps eliminate these risks before they become production issues.
| Topic | Technical Description |
|---|---|
| General Server Information | Validate Domain Controller hostnames, IP configurations, operating system versions, patch levels, uptime, hardware resources, and virtualization status. |
| Domain & Forest Information | Review forest/domain names, functional levels, child domains, trust relationships, and overall Active Directory topology. |
| FSMO Role Validation | Verify the location, availability, and health status of all FSMO roles. |
| DCDIAG Health Checks | Review dcdiag /v results including DNS, replication, services, advertising, and machine account validations. |
| Replication Validation | Validate Active Directory replication health using repadmin and identify latency or replication failures. |
| DNS Validation | Verify AD-integrated DNS zones, SRV records, forwarders, reverse lookup zones, and name resolution functionality. |
| SYSVOL & DFSR Validation | Validate SYSVOL availability, DFSR replication health, backlog status, and DFSR event logs. |
| Time Synchronization Validation | Review NTP configuration, PDC Emulator time source, and synchronization consistency across Domain Controllers. |
| Global Catalog Validation | Verify Global Catalog availability and site placement configuration. |
| Functional Level & Schema Validation | Validate forest/domain functional levels and Active Directory schema version compatibility. |
| Kerberos & NTLM Validation | Review Kerberos policies, NTLM usage, and legacy authentication dependencies. |
| Event Log Review | Analyze Directory Service, DNS Server, DFS Replication, System, and Security event logs for critical issues. |
| Backup Validation | Verify System State backup availability and recovery readiness. |
| Domain Trust Validation | Validate external, forest, and shortcut trust relationships and authentication health. |
| Windows Firewall Validation | Verify required AD DS, DNS, LDAP, RPC, and Kerberos communication ports. |
| Strict Replication Consistency | Validate Strict Replication Consistency configuration to prevent lingering object replication. |
| Kerberos RC4 Validation | Identify systems still using RC4 encryption and validate AES compatibility readiness. |
| Privileged Group Membership Review | Review memberships of Domain Admins, Enterprise Admins, and other privileged Active Directory groups. |
| AD Sites & Services Validation | Validate AD site topology, subnet mappings, and replication site link configurations. |
| Static & Dynamic DNS Record Validation | Review stale, orphaned, duplicate, and dynamically registered DNS records. |
| ADPrep & Schema Preparation | Validate ADPrep requirements and schema extension readiness for Windows Server 2025. |
| Tombstone Lifetime & Recycle Bin Validation | Review Tombstone Lifetime configuration and Active Directory Recycle Bin status. |
| LDAP Signing / Channel Binding / NTLM Hardening | Validate LDAP signing, channel binding policies, and NTLM hardening configurations. |
