Consider the following scenario:
- A Network Load Balancing (NLB) farm is created by using some computers that are running Windows Server 2003 Service Pack 2 (SP2) or Windows Server 2008 R2.
- Some virtual private network (VPN) servers are hosted in the NLB farm.
- You create some Point-to-Point Tunneling Protocol (PPTP) connections to the VPN servers through the NLB farm.
- A new NLB node is added to the NLB farm.
In this scenario, the existing PPTP connections do not work after the convergence is finished. If you analyze the captured network trace, you find that all Generic Routing Encapsulation packets over the PPTP connections are dropped by NLB.
The issue is caused by the Network Load Balancing (NLB) component.
After a new NLB node is added to the NLB farm, and after the convergence is finished, some active connections that are connected to the first NLB node are transferred to the new one for load balancing. However, some connection attributes are not transferred correctly. Therefore, the NLB component drops all Generic Routing Encapsulation packets.
Hotfix information
A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Prerequisites
To apply this hotfix, your computer must be running Windows Server 2003 Service Pack 2 (SP2) or Windows Server 2008 R2.
For more information about how to obtain a Windows Server 2003 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
889100Â
(http://kbalertz.com/Feedback.aspx?kbNumber=889100/
)
How to obtain the latest service pack for Windows Server 2003
Restart requirement
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
File information
The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2003 file information notes
- In addition to the files that are listed in these tables, this hotfix also installs an associated security catalog file (KB977172.cat) that is signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2003 SP2
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| File name | File version | File size | Date | Time | Platform |
|---|
| Wlbs.sys | 5.2.3790.4621 | 169,984 | 17-Nov-2009 | 19:36 | x86 |
For all supported x64-based versions of Windows Server 2003 SP2
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| File name | File version | File size | Date | Time | Platform |
|---|
| Wlbs.sys | 5.2.3790.4621 | 280,576 | 17-Nov-2009 | 20:49 | x64 |
For all supported IA-64-based versions of Windows Server 2003 SP2
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| File name | File version | File size | Date | Time | Platform |
|---|
| Wlbs.sys | 5.2.3790.4621 | 396,800 | 18-Nov-2009 | 01:42 | IA-64 |
Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
- The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2008 R2
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| File name | File version | File size | Date | Time | Platform |
|---|
| Nlb.sys | 6.1.7600.20757 | 339,968 | 17-Jul-2010 | 06:22 | x64 |
For all supported IA-64-based versions of Windows Server 2008 R2
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| File name | File version | File size | Date | Time | Platform |
|---|
| Nlb.sys | 6.1.7600.20757 | 778,240 | 17-Jul-2010 | 05:22 | IA-64 |
Workaround for Windows Server 2003
To work around the issue, restart all NLB nodes at the same time.
Workaround for Windows Server 2008 R2
To work around the issue, restart all NLB nodes at the same time.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684Â
(http://kbalertz.com/Feedback.aspx?kbNumber=824684/
)
Description of the standard terminology that is used to describe Microsoft software updates
Additional file information
Additional file information for Windows Server 2008 R2
Additional files for all supported x64-based versions of Windows Server 2008 R2
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| File name | Amd64_d4e3cdfd263857d569ee6f5fefe88af3_31bf3856ad364e35_6.1.7600.20757_none_bf9a7f009033ea87.manifest |
| File version | Not Applicable |
| File size | 726 |
| Date (UTC) | 17-Jul-2010 |
| Time (UTC) | 11:40 |
| Platform | Not Applicable |
|
| File name | Amd64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7600.20757_none_0aaafc564b1e7461.manifest |
| File version | Not Applicable |
| File size | 2,669 |
| Date (UTC) | 17-Jul-2010 |
| Time (UTC) | 08:53 |
| Platform | Not Applicable |
|
| File name | Update.mum |
| File version | Not Applicable |
| File size | 1,689 |
| Date (UTC) | 17-Jul-2010 |
| Time (UTC) | 11:40 |
| Platform | Not Applicable |
|
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
| File name | Ia64_150b9419597a6de8cb4be9f6dfd849ff_31bf3856ad364e35_6.1.7600.20757_none_98ce845c94bfb3e8.manifest |
| File version | Not Applicable |
| File size | 724 |
| Date (UTC) | 17-Jul-2010 |
| Time (UTC) | 11:40 |
| Platform | Not Applicable |
|
| File name | Ia64_microsoft-windows-n..ncing-networkdriver_31bf3856ad364e35_6.1.7600.20757_none_ae8e04c892bf0c27.manifest |
| File version | Not Applicable |
| File size | 2,667 |
| Date (UTC) | 17-Jul-2010 |
| Time (UTC) | 08:50 |
| Platform | Not Applicable |
|
| File name | Update.mum |
| File version | Not Applicable |
| File size | 1,461 |
| Date (UTC) | 17-Jul-2010 |
| Time (UTC) | 11:40 |
| Platform | Not Applicable |
|