Article ID: 914217 - View products that this article applies to.
Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/ )Description of the Microsoft Windows registry
The Domain Name System (DNS) client screening feature lets Microsoft Windows Server 2003-based computers determine whether a DNS server is reachable from the configured interface. However, this feature mayalso prevent access to a DNS server that is otherwise available.
This article describes how to turn off the DNS client screening feature.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To turn off the DNS client screening feature, you must first create the ScreenUnreachableServers registry entry. To do this, follow these steps:
It is by design that the DNS Client service does not access the DNS servers that appear to be unreachable from the interface on which they are configured. The DNS servers are marked unreachable for the server even though they may be available to the other network adapter on the same server.
When you disable the ScreenUnreachableServers registry entry, you also disable the operating system feature that removes unreachable DNS servers from their caches. This may cause delays in name resolution. Therefore, we do not recommend that you disable the ScreenUnreachableServers registry entry unless the following conditions are true:
Article ID: 914217 - Last Review: October 30, 2006 - Revision: 1.2