Remove a Child Domain from Root Domain running Windows Server 2019 (Child Domain unavailable)

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Remove a Child Domain from Root Domain running Windows Server 2019 (Child Domain unavailable - for lab environment)

1. Prepare

DC31 : Domain Controller(Yi.vn - Root Domain)    |   DC32 : Domain Controller(Site01.Yi.vn - Child Domain - Unavailable)

2. Step by step : Remove Site01.Yi.vn from Yi.vn (Site01.Yi.vn unavailable)

DC31 : Remove Site01.Yi.vn

Start - cmd - ping Site01.Yi.vn, ping DC32.Site01.Yi.vn     === fail               # Check Site01.Yi.vn

Server Manager - Tools - Active Directory Users and Computers - Right-click 'Active Directory Users and Computers [DC31.Yi.vn]' - Change Domain...

Browse... : Site01.Yi.vn - OK     === Unavailable        # Check Site01.Yi.vn

Computers Container - Right-click DC32 - Delete
 
Server Manager - Tools - DNS - DC31 - Forward Lookup Zones - Yi.vn - Right-click Site01 - Delete

Server Manager - Tools - ADSI Edit - Right-click 'ADSI Edit' - Connect to... - Select a well known Naming Context : Default naming Context

Default naming Context [DC31.Yi.vn] - DC=Yi,DC=vn - CN=System - Right-click 'CN=Site01.Yi.vn' - Delete - Yes

Right-click 'ADSI Edit' - Connect to... - Select a well known Naming Context : Choose 'Configuration' - Configuration[DC31.Yi.vn] - CN=Configuration,DC=Yi,DC=vn

CN=Sites - CN=Default-Fist-Site-Name - CN=Servers - Right-click 'CN=DC32' - Delete - Yes

Start - cmd, type :

ntdsutil                                           + ntdsutil : partition management        + partition management : connections

server connections : connect to server DC31        + server connections : quit              + partition management : list (Found 7 Naming Context(s))
   
     0 - CN=Configuration,DC=Yi,DC=vn
     1 - DC=Yi,DC=vn
     2 - CN=Schema,CN=Configuration,DC=Yi,DC=vn
     3 - DC=DomainDnsZones,DC=Yi,DC=vn
     4 - DC=ForestDnsZones,DC=Yi,DC=vn
     5 - DC=Site01,DC=Yi,DC=vn
     6 - DC=DomainDnsZones,DC=Site01,DC=Yi,DC=vn

partition management: delete nc DC=DomainDnsZones,DC=Site01,DC=Yi,DC=vn     === The operation was successful  === OK

partition management: delete nc DC=Site01,DC=Yi,DC=vn                       === The operation was successful  === OK

Server Manager - Tools - Active Directory Users and Computers - Yi.vn - Find object in Active Directory Domain Services   === Site01.Yi.vn removed

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