Error message when you try to join a Windows Vista-based client computer to a top level domain

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asked Feb 19, 2015 by anonymous


When you try to join a Windows Vista-based client computer to a top level domain (TLD) that has a purely numeric suffix, the Windows Vista-based client computer cannot join the domain and you receive the following error message:

“Computer Name/Domain Changes

An Active Directory Domain Controller for the domain <DNS domain name> could not be contacted. Ensure that the domain name is typed correctly. If the name is correct, click Details for troubleshooting information.”



To resolve this issue, add the ScreenBadTlds registry entry. Adding this registry entry prevents the client computer from performing the test to determine whether the top level domain is supported.


To add this registry entry, follow these steps.


  1. Go to Start
  2. Type regedit in the Start Search box, and then press ENTER. If you are prompted for an administrator password or for confirmation, type the password or provide confirmation.
  3. Find and then click the following registry subkey:


  1. In the Edit menu, point to New, and then select DWORD Value.
  2. Type ScreenBadTlds, and then press ENTER.
  3. Right-click ScreenBadTlds, and then click Modify.
  4. In the Value data box, type 0, and then click OK.
  5. Close Registry Editor.

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