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.

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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.

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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

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, x86-based versions

File name	File version	File size	Date	Time	Platform
Rasmans.dll	6.0.6000.20549	237,056	03-Mar-2007	02:51	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Rasmans.dll	6.0.6000.20549	281,600	03-Mar-2007	04:00	x64

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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

To work around this problem, follow these steps:

1.	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.
2.	Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\netbt\Linkage
3.	On the File menu, click Export.
4.	In the Save box, specify a location where you want to save the file.
5.	In the File name box, enter a name for the file.
6.	In the Save as type box, click Registry Files.
7.	In the Export range box, click Selected branch, and then click Save.
8.	Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\netbt\Linkage
9.	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.
10.	Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\smb\Linkage
11.	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.
12.	Exit Registry Editor, and restart the computer.

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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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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:

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