Group Policy settings are not applied on member computers that are running Windows Server 2008 or Windows Vista SP1 when certain SMB signing policies are enabled

Group Policy settings are not applied on member computers that are running Windows Server 2008 or Windows Vista SP1 when certain SMB signing policies are enabled

Article ID : 950876
Last Review : May 12, 2008
Revision : 1.0
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SYMPTOMS

Consider the following scenario:

• The following policies are enabled on a domain controller that is running Windows Server 2003 in a domain:

• Computer Configuration Windows Settings Security Settings Local Policies Security Options Microsoft network server: Digitally sign communications (always)
• Computer Configuration Windows Settings Security Settings Local Policies Security Options Microsoft network server: Digitally sign communications (if client agrees)
• The following policies are enabled on a member computer that is running Windows Vista Service Pack 1 or Windows Server 2008 in the same domain:

• Computer Configuration Windows Settings Security Settings Local Policies Security Options Microsoft network client: Digitally sign communications (always)
• Computer Configuration Windows Settings Security Settings Local Policies Security Options Microsoft network client: Digitally sign communications (If server agrees)

In this scenario, Group Policy settings are not applied on the member computer. Additionally, the following event is logged in the System log on the member computer:

Date: Date
Event ID: 1058
Level: Error
Keywords:
User: UserSID
Computer: CompuerName
Description:
The processing of Group Policy failed. Windows attempted to read the file path gpt.ini from a domain controller and was not successful. Group Policy settings may not be applied until this event is resolved. This issue may be transient and could be caused by one or more of the following:
a) Name Resolution/Network Connectivity to the current domain controller.
b) File Replication Service Latency (a file created on another domain controller has not replicated to the current domain controller).
c) The Distributed File System (DFS) client has been disabled.

Note This problem occurs only on member computers that are running Windows Server 2008 or Windows Vista Service Pack 1 (SP1). It does not occur on member computers that are running Windows Server 2003, Windows XP, or the release version of Windows Vista.

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CAUSE

When a Server Message Block (SMB) version 1 client establishes a non-guest session or a non-anonymous session with a server, the client enables security signatures for the server. Later sessions then inherit the security signature sequence that is already established.

To improve security, Windows Server 2008 and Windows Vista SP1 prevent server authenticated connections from being maliciously downgraded to a guest session or to an anonymous session. However, this improved security does not address the scenario that is described in the Symptoms section.

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RESOLUTION

Windows Server 2008 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 (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 (http://support.microsoft.com/contactus/?ws=support)

Prerequisites

No prerequisites are required to apply 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.

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 Server 2008, x86-based versions
File name File version File size Date Time Platform
Mrxsmb10.sys 6.0.6001.22156 211,968 12-Apr-2008 00:43 x86
Windows Server 2008, Itanium-based versions
File name File version File size Date Time Platform
Mrxsmb10.sys 6.0.6001.22156 655,360 12-Apr-2008 00:54 IA-64
Windows Server 2008, x64-based versions
File name File version File size Date Time Platform
Mrxsmb10.sys 6.0.6001.22156 272,384 12-Apr-2008 01:17 x64

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Windows Vista Service Pack 1 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 (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 (http://support.microsoft.com/contactus/?ws=support)

Prerequisites

To apply this hotfix, you must have Windows Vista SP1 installed.

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 with Service Pack 1, x86-based versions
File name File version File size Date Time Platform
Mrxsmb10.sys 6.0.6001.22156 211,968 12-Apr-2008 00:43 x86
Windows Vista with Service Pack 1, Itanium-based versions
File name File version File size Date Time Platform
Mrxsmb10.sys 6.0.6001.22156 655,360 12-Apr-2008 00:54 IA-64
Windows Vista with Service Pack 1, x64-based versions
File name File version File size Date Time Platform
Mrxsmb10.sys 6.0.6001.22156 272,384 12-Apr-2008 01:17 x64

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WORKAROUND

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:

322756 (/Feedback.aspx?kbNumber=322756/) How to back up and restore the registry in Windows

To work around this problem, use one of the following methods.

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Method 1

Disable the following policy on the member computers that are running Windows Server 2008 or Windows Vista SP1:

Computer Configuration Windows Settings Security Settings Local Policies Security Options Microsoft network server: Digitally sign communications (always)

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Method 2

On the member computers that are running Windows Server 2008 or Windows Vista SP1, follow these steps:

1. Click Start, type regedit in the Start Search box, and then press ENTER.
2. Locate the RequireSecuritySignature registry entry under the following registry subkey:

HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services lanmanworkstation parameters
3. Right-click RequireSecuritySignature, and then click Modify.
4. In the Value data box, type 0, and then click OK.
5. Exit Registry Editor.

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Method 3

On the member computers that are running Windows Server 2008 or Windows Vista Service Pack 1, follow these steps:

1. Click Start, type regedit in the Start Search box, and then press ENTER.
2. Locate the AllowGuestAuthWhenSigningRequired registry entry under the following registry subkey:

HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services lanmanworkstation parameters
3. Right-click AllowGuestAuthWhenSigningRequired, and then click Modify.
4. In the Value data box, type 1, and then click OK.
5. Exit Registry Editor.

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STATUS

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

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MORE INFORMATION

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 (/Feedback.aspx?kbNumber=824684/) Description of the standard terminology that is used to describe Microsoft software updates

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APPLIES TO
• Windows Vista Service Pack 1, when used with:
    Windows Vista Enterprise
    Windows Vista Ultimate
    Windows Vista Business
    Windows Vista Business 64-bit Edition
    Windows Vista Ultimate 64-bit Edition
    Windows Vista Home Premium 64-bit Edition
    Windows Vista Home Basic 64-bit Edition
    Windows Vista Enterprise 64-bit Edition
• Windows Server 2008 Standard
• Windows Server 2008 Enterprise
• Windows Server 2008 Datacenter
• Windows Server 2008 Datacenter without Hyper-V
• Windows Server 2008 Enterprise without Hyper-V
• Windows Server 2008 for Itanium-Based Systems
• Windows Server 2008 Standard without Hyper-V

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Keywords: 
kbexpertiseinter kbbug kbfix kbhotfixserver kbqfe KB950876

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Microsoft Knowledge Base Article

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