I am unable to remove domain controller manual.

Hi Support,

I have remove the domain controller 2008 r2 and promote again but name is still showing and RODC unable to communicate with new Domain controller.

I have remove all the old domain controller from DNS and site & services and active directory pc but still when run the below command the showing old server name:

C:\Windows\system32>Repadmin /replsum
Replication Summary Start Time: 2019-06-03 17:31:11

Beginning data collection for replication summary, this may take awhile:
  .....................

Source DSA          largest delta    fails/total %%   error
 TEST-LAB-DC-01    01d.21h:01m:01s   47 /  47  100  (8524) The DSA operation is unable to proceed because of a DNS lookup failure.
 LAB-TEST-ADC-01           13m:20s    0 /   5    0
 LAB-TEST-DC-01            06m:22s    0 /  10    0

 

Remove the Old server TEST-LAB-DC-01 ip address 10.0.045

 Active Directory Domain Services did not perform an authenticated re
mote procedure call (RPC) to another directory server because the desired servic
e principal name (SPN) for the destination directory server is not registered on
 the Key Distribution Center (KDC) domain controller that resolves the SPN.
         An Warning Event occurred.  EventID: 0x8000059B
            Time Generated: 06/03/2019   14:43:45
            Event String:
            The Knowledge Consistency Checker (KCC) encountered an unexpected er
ror while performing an Active Directory Domain Services operation.
         An Error Event occurred.  EventID: 0xC0000B1B
            Time Generated: 06/03/2019   14:43:45
            Event String:
            The Knowledge Consistency Checker was unable to locate a replication
 connection for the read-only local directory service.  A replication connection
 with the following option must exist in the forest for correct FRS system behai
vor.
         An Warning Event occurred.  EventID: 0x8000059B
            Time Generated: 06/03/2019   14:45:56
            Event String:
            The Knowledge Consistency Checker (KCC) encountered an unexpected er
ror while performing an Active Directory Domain Services operation.
         An Error Event occurred.  EventID: 0xC0000B1B
            Time Generated: 06/03/2019   14:45:56
            Event String:
            The Knowledge Consistency Checker was unable to locate a replication
 connection for the read-only local directory service.  A replication connection
 with the following option must exist in the forest for correct FRS system behai
vor.
         An Warning Event occurred.  EventID: 0x8000059B
            Time Generated: 06/03/2019   14:46:13
            Event String:
            The Knowledge Consistency Checker (KCC) encountered an unexpected er
ror while performing an Active Directory Domain Services operation.
         An Error Event occurred.  EventID: 0xC0000B1B
            Time Generated: 06/03/2019   14:46:13
            Event String:
            The Knowledge Consistency Checker was unable to locate a replication
 connection for the read-only local directory service.  A replication connection
 with the following option must exist in the forest for correct FRS system behaivor.