If you create a Hosts file in another folder or with a different name and you then copy or rename the file to %SystemRoot%\System32\Drivers\Etc\Hosts, you may not be able to resolve host names in the new Hosts file. If you open the new Hosts file in Notepad one time and then save it, you can then resolve the names in the new Host file.
The DNS Cache service waits for changes to the Hosts files from a FindFirstChangeNotification notification. However, Windows tries to open the Hosts file as soon as a change has been signaled.
This problem can also occur if another process has opened the Hosts file share in Exclusive mode.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.The English version of this fix should have the following file attributes or later: