Open Software Solutions

You cannot access a shared network resource that is hosted by a Windows Vista-based computer if one of the following conditions is true:

•	The size of the server message block (SMB) request packet exceeds the maximum transmission unit (MTU) size of the requesting device.
•	The size of the SMB request packet exceeds the MTU size of the router that connects the requesting device with the server.

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This problem occurs because the server does not respond to an SMB request if the SMB request packet is fragmented. The SMB request packet is fragmented when its size exceeds the size of the MTU.

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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:

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.

Registry information

You do not have to make any changes to the registry.

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, 32-bit versions

File name	File version	File size	Date	Time	Platform
Srvnet.sys	6.0.6000.20577	85,504	12-Apr-2007	01:59	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Srvnet.sys	6.0.6000.20577	118,272	12-Apr-2007	02:19	x64

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

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For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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