Applications or services that rely on the Named Pipe File System may encounter latency or time-out issues when many connections are made to a named pipe in Windows Server 2008 or in Windows Vista SP1

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Article ID: 954442 - View products that this article applies to.
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SYMPTOMS

Applications or services that rely on the Named Pipe File System (Npfs.sys) may encounter latency or time-out issues when many connections are made to a named pipe in Windows Server 2008 or in Windows Vista Service Pack 1 (SP1).

For example, you may find that print jobs are handled slowly or that the jobs time out and fail on a Windows Server 2008-based print server.

CAUSE

This problem occurs when too many connections are made to a named pipe. When this occurs, the Named Pipe File System takes a long time to find clients that are in the listening state.

RESOLUTION

To resolve this problem, install the following hotfix. After you install this hotfix, the NPFS maintains a new list that contains only the clients in the listening state. This new list can resolve this latency issue.

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. 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 Web site:
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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix on Windows Vista-based computer, you must have Windows Vista SP1 installed.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:
935791 How to obtain the latest Windows Vista service pack
No prerequisites are required for Windows Server 2008-based computers.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Windows Vista and Windows Server 2008 file information notes

The MANIFEST files (.manifest) and MUM files (.mum) that are installed for each environment are listed separately . MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2008 and Windows Vista
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File nameFile versionFile sizeDateTimePlatform
Npfs.sys6.0.6001.2228135,32807-Oct-200800:53x86
For all supported x64-based versions of Windows Server 2008 and Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Npfs.sys6.0.6001.2228144,54407-Oct-200801:57x64
For all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Npfs.sys6.0.6001.22281110,59207-Oct-200801:50IA-64

STATUS

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

MORE INFORMATION

Additional file information for Windows Server 2008 and for Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File namePackage_1_for_kb954442~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,772
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_2_for_kb954442~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,939
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_3_for_kb954442~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,777
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_4_for_kb954442~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,777
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,367
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_client~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,431
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,421
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_sc~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,423
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,425
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_server~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,431
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_winpesrv_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,422
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_winpesrv~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,429
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File nameX86_cb74600fe57af1de600c383fc3a9840a_31bf3856ad364e35_6.0.6001.22281_none_2588e706e8e963c1.manifest
File versionNot Applicable
File size692
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File nameX86_microsoft-windows-npfs_31bf3856ad364e35_6.0.6001.22281_none_a6a5a4783648c8df.manifest
File versionNot Applicable
File size5,031
Date (UTC)07-Oct-2008
Time (UTC)04:06
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameAmd64_642c5a259d9109fe4f79364bf9b56f28_31bf3856ad364e35_6.0.6001.22281_none_1369bb45223f351b.manifest
File versionNot Applicable
File size696
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File nameAmd64_microsoft-windows-npfs_31bf3856ad364e35_6.0.6001.22281_none_02c43ffbeea63a15.manifest
File versionNot Applicable
File size5,035
Date (UTC)07-Oct-2008
Time (UTC)05:14
PlatformNot Applicable
File namePackage_1_for_kb954442~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,782
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_2_for_kb954442~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,951
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_3_for_kb954442~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,787
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_4_for_kb954442~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,787
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,375
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_client~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,439
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,429
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,431
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,433
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_server~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,439
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_winpesrv_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,430
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,437
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameIa64_237761b7b09c35ea096435dea83f4741_31bf3856ad364e35_6.0.6001.22281_none_985c150e6ca03a16.manifest
File versionNot Applicable
File size694
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File nameIa64_microsoft-windows-npfs_31bf3856ad364e35_6.0.6001.22281_none_a6a7486e3646d1db.manifest
File versionNot Applicable
File size5,033
Date (UTC)07-Oct-2008
Time (UTC)06:45
PlatformNot Applicable
File namePackage_1_for_kb954442~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,777
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_2_for_kb954442~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,782
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_3_for_kb954442~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,782
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_sc_0~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,425
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_sc~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,426
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,429
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_server~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,434
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_winpesrv_0~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,426
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable
File namePackage_for_kb954442_winpesrv~31bf3856ad364e35~ia64~~6.0.1.0.mum
File versionNot Applicable
File size1,433
Date (UTC)07-Oct-2008
Time (UTC)18:25
PlatformNot Applicable

Properties

Article ID: 954442 - Last Review: October 8, 2011 - Revision: 2.0
APPLIES TO
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Ultimate
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
Keywords: 
kbautohotfix kbexpertiseinter kbfix kbbug kbqfe KB954442

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