Adding a Windows Server 2022 Domain Controller to an Existing Domain with a Windows Server 2008 R2

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                          Adding a Windows Server 2022 Domain Controller to an Existing Domain with a Windows Server 2008 R2 Domain Controller

1. Prepare

- DC21 : Domain Controller(Yi.vn)        |    DC25 : Workgroup running Windows Server 2022

2. Step by step : Join DC25 to Yi.vn and promote to Domain Controller role

- DC25 : Join to Yi.vn and promote to Domain Controller role

 + Join to Yi.vn --- Restart server

 + Server Manager - Manage - Add Roles and Features - Next to Server Roles - Select "Active Directory Domain Services" - Add Features - Next and Install - Close

 + Click Notifications - Click "Promote this server to a domain controller" - Select "Add a domain controller to an existing domain"

   === fail 'Verification of replica failed. The forest functional level is not supported.

              To install a Windows 2022 domain or domain controller, the forest functional level must be Windows Server 2008 or higher.'  

- DC21 : Raise forest functional level and SYSVOL migration from FRS to DFSR

 + Start - Administrative Tools - Active Directory Domains and Trusts - Right-Click 'Active Directory Domains and Trusts [DC21.Yi.vn]'

   - Raise Forest Functional Level... - Select an available forest functional level: Choose 'Windows Server 2008 R2' - Raise - OK

   + Right-Click Yi.vn - Raise Domain Functional Level... - Check current domain functional level : Windows Server 2008 R2 - OK

 + Start - cmd, type :

   + dcdiag /e /test:sysvolcheck /test:advertising         # Test that sysvol is shared and advertising

   + dfsrmig /getglobalstate                               # Verify the system uses the FRS or DFRS

   + dfsrmig /setglobalstate 1                             # Waiting between 15 min to 1 hour

   + dfsrmig /getmigrationstate                            # Verify that all domain controllers have migrated successfully to the worldwide state

   + dfsrmig /setglobalstate 2                             # Waiting between 15 min to 1 hour

   + dfsrmig /getmigrationstate                            # Verify that all domain controllers have migrated successfully to the worldwide state      

   + dfsrmig /setglobalstate 3                             # Waiting between 15 min to 1 hour

   + dfsrmig /getmigrationstate                            # Verify that all domain controllers have migrated successfully to the worldwide state

   + net share                                             # Verify the SYSVOL share and type net share

 + Start - services.msc - check 'File Replication Service' Disabled and Stopped  --- OK

- DC25 : Promote to Domain Controller role

 + Click Notifications - Click 'Promote this server to a domain controller' - Select "Add a domain controller to an existing domain"

   - Type the Directory Services Restore Mode (DSRM) password : Enter Password and Confirm password - Next to Install - Restart

 + Logon use account Yi\administrator - Server Manager - Tools - Active Directory Users and Computers  = OK

 + Start - cmd - Type : nltest /dclist:Yi.vn  === Check Domain Controllers  

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