Microsoft KB Archive/934202

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Article ID: 934202

Article Last Modified on 8/29/2007


  • 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


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.


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.


Hotfix information

A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:


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
File name File version File size Date Time Platform
Csc.sys 6.0.6000.20581 319,488 19-Apr-2007 01:00 x86
Cscmig.dll 6.0.6000.20581 105,984 19-Apr-2007 02:13 x86
Cscsvc.dll 6.0.6000.20581 466,432 19-Apr-2007 02:13 x86
Mrxsmb10.sys 6.0.6000.20581 211,968 19-Apr-2007 01:00 x86
Mrxsmb.sys 6.0.6000.20581 101,888 19-Apr-2007 01:00 x86
Windows Vista, 64-bit versions
File name File version File size Date Time Platform
Csc.sys 6.0.6000.20581 417,792 19-Apr-2007 01:12 x64
Cscmig.dll 6.0.6000.20581 134,144 19-Apr-2007 03:21 x64
Cscsvc.dll 6.0.6000.20581 574,976 19-Apr-2007 03:21 x64
Mrxsmb10.sys 6.0.6000.20581 271,872 19-Apr-2007 01:12 x64
Mrxsmb.sys 6.0.6000.20581 133,632 19-Apr-2007 01:12 x64


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


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

Additional query words: Slow link detection fails for client-side caching on Windows Vista when connecting over VPN slow-link mode threshold GPO policy slow link speed Throughput Latency "configure slow link mode" group policy

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbexpertisebeginner kbhotfixserver kbwinvistapostrtmfix KB934202