JSI Tip 4655. Logon Failure error when accessing a child domain controller from the parent domain?

When you attempt to access a child domain controller from the parent domain, you receive:

Logon Failure: The target account name is incorrect.

This error will occur if a computer in the parent domain has the same computer name as a computer in the child domain.

To resolve the problem, rename one of the computers.

NOTE: If the computer no longer exists, delete it's machine account.