FIX: More than 1,000 rules in the NRPT causes no rules to be loaded into memory in Windows

Applies to: Windows 8Windows 8 EnterpriseWindows 8 Pro


On a computer that is running Windows 7, Windows Server 2008 R2, Windows 8 or Windows Server 2012, there is a limit of 1,000 rules in the Name Resolution Policy Table (NRPT) that the DNS Client service can use. However, this limit is not enforced when you add a rule. Instead, no rules are loaded into memory when this limit is exceeded.

More Information

This fix that is described in this section removes the 1,000-rule limit for the NRPT. Additionally, this fix minimizes the effect on performance of adding rules.

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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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, go to 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 the release version of Windows 7, Windows Server 2008 R2, Windows 8 or Windows Server 2012 installed.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any 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 Microsoft uses to describe software updates.