Unable to join machines to the domain. Error Message “The Specified User already exists”
You are trying to join a computer to the Active Directory domain and getting the below error:
Error Description: Unable to join machines to the domain. Error Message “The Specified User already exists”
PROBLEM DESCRIPTION :
We were not able to join the machines to the domain and got the following error message:
“The Specified User already exists”
In the AD Users and Computers we were not able to “Find” any such account in the entire directory as the disabled accounts existed in a Non Built-in container.
Resolution:
assuming FQDN= abc.xyz.ad
We took the LDIFDE dump for the entire domain partition using the command:
ldifde -f out.txt -d "dc=abc,dc=xyz,dc=ad" We now found that there were multiple disabled accounts present under a Non-Built-in container in the AD.
We deleted the machine accounts from the AD container and then forced the replication using the command:
repadmin /syncall /AePWe now successfully joined all the machines to the domain.
The issue is resolved.
Reference: