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Credential conflict when trying to move PCs from workgroup to a domain

I have a fairly new Windows 2000 server domain using Active Directory. It was set up as a workgroup instead of a domain, and I've converted it over. Some of the computers were able to get out of the workgroup and join the domain, but on three computers I get an error message that tells me the credentials conflict with an existing set of credentials and the computer is not allowed to join. Any ideas?

So far I have tried changing the workgroup name, joining the domain, using the admin credentials, using the user credentials, setting up the computer account on the server and then trying to join the computer to the domain.

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  1. Take the workstation out of the domain and put it in a workgroup.
  2. Shut down the machine.
  3. Check AD to make sure that the machine name does not appear in the computer organizational unit. If it does exist, delete it.
  4. Then turn the machine back on.
  5. Join the domain.
  6. Reboot.

This was first published in February 2003

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