A compliant NAP client is denied full network access by an NAP health policy server that is running Windows Server 2008 R2

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Article ID: 2411053 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You install the Network Policy Server (NPS) role service on a computer that is running Windows Server 2008 R2. NPS is a role service for the Network Policy and Access Services (NPAS) server role.
  • You use the installed System Health validator (SHV) when you configure Network Access Protection (NAP) health policies on the computer.
  • An NAP-capable client computer that is compliant with the health policy tries to connect to the network.
In this scenario, the health policy validation times out. The client computer is denied full network access and is connected to a restricted network. Additionally, the following event is logged in the security event log on the computer:


Log name: security
Source: Microsoft-Windows-Security-Auditing
Date: <date>
Event ID: 6278
Task category: network policy server
Level: information
Keywords: success audit
User: N/A
Computer: <computer name>
Description:
Network Policy Server granted full access to a user because the host met the defined health policy
Non-compliance
No data
Server component under SHV timed out for on demand
Configuration Manager System Health Validator
0

CAUSE

The issue occurs because of a race condition during the health policy validation.

When the NPS service receives the statement of health (SoH) of the NAP client, the NPS service queues the SoH in the Windows Security Health Validator (WSHV) and sets the response to pending. After WSHV validates the SoH, the response is set to completed. When a race condition occurs, the response is set to pending after the SoH is validated. Therefore, the health policy validation times out, and the NAP client is denied full network access.

RESOLUTION

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, visit the following Microsoft website:
http://support.microsoft.com/contactus/?ws=support
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.

Prerequisites

To apply this hotfix, your computer must be running Windows Server 2008 R2. Additionally, you must install the Network Policy Server (NPS) role service on the computer.

Registry information

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

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Qshvhost.dll6.1.7600.20799223,23214-Sep-201005:23x64
Qsvrmgmt.dll6.1.7600.20799124,41614-Sep-201005:23x64
Qshvhost.dll6.1.7600.20799167,93614-Sep-201004:36x86
Qsvrmgmt.dll6.1.7600.2079999,32814-Sep-201004:36x86

STATUS

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

MORE INFORMATION

For more information about NAP, visit the following Microsoft website:
Network Access Protection
For more information about the NAP client, visit the following Microsoft website:
NAP Client Architecture
For more information about NAP enforcement points, visit the following Microsoft website:
NAP Server-side Architecture
For more information about NAP Deployment, visit the following Microsoft website:
Network Access Protection Deployment Guide
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_a62ae83316a1b0741ad118d2e20c0f70_31bf3856ad364e35_6.1.7600.20799_none_b5d80076369dc6fa.manifest
File versionNot Applicable
File size1,086
Date (UTC)14-Sep-2010
Time (UTC)19:07
PlatformNot Applicable
File nameAmd64_microsoft-windows-n..sprotection-shvhost_31bf3856ad364e35_6.1.7600.20799_none_3c372b3629900e32.manifest
File versionNot Applicable
File size15,795
Date (UTC)14-Sep-2010
Time (UTC)05:58
PlatformNot Applicable
File nameUpdate.mum
File versionNot Applicable
File size1,665
Date (UTC)14-Sep-2010
Time (UTC)19:07
PlatformNot Applicable
File nameX86_microsoft-windows-n..sprotection-shvhost_31bf3856ad364e35_6.1.7600.20799_none_e0188fb271329cfc.manifest
File versionNot Applicable
File size15,791
Date (UTC)14-Sep-2010
Time (UTC)05:02
PlatformNot Applicable

Properties

Article ID: 2411053 - Last Review: February 1, 2012 - Revision: 4.0
APPLIES TO
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
Keywords: 
kbautohotfix kbqfe kbHotfixServer kbfix kbsurveynew kbexpertiseadvanced KB2411053

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