You experience slow performance on a Windows Vista-based computer after you establish a VPN connection

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Article ID: 934202 - View products that this article applies to.
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SYMPTOMS

On a Windows Vista-based computer, you experience slow performance after you establish a VPN connection. Additionally, it may take several minutes to open a redirected shell folder. This problem occurs if the following conditions are true:
  • Offline files are enabled on the computer.
  • Some offline files are cached on the local computer.
  • You logged on to the computer when you were offline.
  • The VPN connection is based on a slow connection.
This problem usually lasts several minutes and then disappears.

CAUSE

This problem occurs because the slow connection detection does not occur immediately after the VPN connection is established. By design, the system periodically checks whether the connection is slow. Therefore, the offline status may remain Online until the next slow connection detection starts. If you first log on to a computer when you are offline, and then you connect to a file server, the system does not immediately check the connection. Instead, the system synchronizes offline files. If the connection is slow, the synchronization may take a long time.

When the system starts the periodical check and detects the connection as slow, the offline status changes to Offline (slow connection). If the synchronization has already started, it does not stop even after the offline status changes to Offline (slow connection). Therefore, the slow performance continues to occur until the synchronization finishes. Then, the next synchronization will not start on the slow connection. Therefore, the problem disappears.

RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. 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

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.

Prerequisites

No prerequisites are required.

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, x86-based versions
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File nameFile versionFile sizeDateTimePlatform
Csc.sys6.0.6000.20581319,48819-Apr-200701:00x86
Cscmig.dll6.0.6000.20581105,98419-Apr-200702:13x86
Cscsvc.dll6.0.6000.20581466,43219-Apr-200702:13x86
Mrxsmb10.sys6.0.6000.20581211,96819-Apr-200701:00x86
Mrxsmb.sys6.0.6000.20581101,88819-Apr-200701:00x86
Windows Vista, 64-bit versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Csc.sys6.0.6000.20581417,79219-Apr-200701:12x64
Cscmig.dll6.0.6000.20581134,14419-Apr-200703:21x64
Cscsvc.dll6.0.6000.20581574,97619-Apr-200703:21x64
Mrxsmb10.sys6.0.6000.20581271,87219-Apr-200701:12x64
Mrxsmb.sys6.0.6000.20581133,63219-Apr-200701:12x64

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

MORE INFORMATION

After you apply this hotfix, slow connection detection starts immediately after the connection is established. If the connection is slow, the offline status transits to Offline very quickly. For more information about the standard terminology that is used to describe Microsoft software updates, 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

Properties

Article ID: 934202 - Last Review: October 8, 2011 - Revision: 6.0
APPLIES TO
  • Windows Vista Starter
  • Windows Vista Home Basic
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Ultimate
  • Windows Vista Business 64-bit Edition
  • Windows Vista Home Premium
Keywords: 
kbautohotfix kbvistasp1fix kbexpertiseinter kbexpertisebeginner kbwinvistapostrtmfix kbbug kbfix kbHotfixServer kbqfe KB934202

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