Microsoft KB Archive/933468

= You cannot access SMB shares on a corporate network through a Remote Access Service (RAS) connection from a computer that is running Windows Vista =

Article ID: 933468

Article Last Modified on 9/11/2007

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APPLIES TO


 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Home Basic 64-bit Edition
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Business
 * Windows Vista Business 64-bit Edition
 * Windows Vista Enterprise
 * Windows Vista Home Basic
 * Windows Vista Ultimate

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
When you establish a Remote Access Service (RAS) connection to a corporate network from a computer that is running Windows Vista, you cannot access Server Message Block (SMB) shares. However, if you use the ping command to test Internet connectivity, the ping test is successful.



CAUSE
This issue occurs when either of the following conditions is true:
 * The TCP port 139 is filtered on the corporate network.
 * NetBIOS over TCP/IP (NetBT) is disabled on the remote Windows Vista client.



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:

http://go.microsoft.com/?linkid=6294451

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:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
There are no prerequisites for installing this hotfix.

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
To use one of the hotfixes in this package, 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, 64-bit versions


WORKAROUND
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To work around this problem, follow these steps:  Click Start, type regedit in the Start Search box, and then click regedit.exe in the Programs list.

If you are prompted for the administrator password or for a confirmation, type your password, or click Continue. Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\netbt\Linkage

 On the File menu, click Export. In the Save box, specify a location where you want to save the file. In the File name box, enter a name for the file. In the Save as type box, click Registry Files.</li> In the Export range box, click Selected branch, and then click 'Save'.</li> Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\netbt\Linkage

</li> In the details pane, right-click the Bind registry entry in the Name column, click Modify, and then copy the data in the Value data box to the clipboard.</li> Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\smb\Linkage

</li> In the details pane, right-click the Bind entry in the Name column, click Modify, paste the data from the clipboard to the Value data text box to override the original data, and then click OK.</li> Exit Registry Editor, and restart the computer.</li></ol>

<div class="status_section">

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

<div class="moreinformation_section">

MORE INFORMATION
This problem does not occur when you use a Microsoft Windows XP-based computer as the remote client. A Windows Vista-based computer requires NetBT to be enabled with connectivity over port 139 for SMB to bind correctly to the RAS adapter. For more information, 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

Keywords: kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver KB933468

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