DNS server does not try the second forwarder and other DNS improvements in Windows Server 2012 R2

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials

This article describes some Domain Name System (DNS) related issues that occur in Windows Server 2012 R2. A hotfix is available to resolve these issues. The hotfix has a prerequisite.


Assume that you have a computer that is running Windows Server 2012 R2. You may encounter one of the following issues:

Issue 1

The DNS server does not try the second forwarder if the first forwarder does not respond.

Issue 2

If the forwarder responds a SERVFAIL error, then the recursive resolver waits for recursion time-out period before responding back the same to the client.

Issue 3

It takes a long time (about 10 minutes) to load of large number of zones (40,000 to 50,000 zones). This is optimized to load in few seconds (about 15 seconds) now.

See DNS Server Startup Time Improvements in Windows Server 2012 R2 for details.

Hotfix information

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 website: 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.


To apply this hotfix, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows Server 2012 R2.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


See the terminology that Microsoft uses to describe software updates.