If you have workstations with duplicate names in a domain, you might not be able to log in to one of these workstations. To rectify this, do the following:
Figure 17-1 Rectifying Duplicate Workstation Names
Log in to the workstation that you are unable to log in to, using the local workstation administrator credentials.
Rejoin the second workstation to the domain using a unique name. You must first unjoin the workstation from the domain and then join the workstation with a unique name.
Rejoin the first workstation, using the same name. You must first unjoin the workstation from the domain and then join the workstation with a unique name.