Symptoms
Assume that you install a version of the Network Driver Interface Specification (NDIS) filter driver that is earlier than NDIS 6.20 on a computer that is running Windows 7 or Windows Server 2008 R2. After you install the NDIS filter driver, the following power management features of the NDIS compliant miniport driver are disabled unexpectedly:
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The Address Resolution Protocol (ARP) offload feature
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The NS offload feature
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The Wake on Wireless LAN (WoWLAN) feature
The issue occurs after you install a program that uses legacy filter drivers. For example, the issue occurs after you install one of the following programs:
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Microsoft Network Monitor 3.4
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Third-party antivirus software
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Third-party firewall or network routing software
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The NDIS filter driver sample that is included in the Microsoft Windows Driver Development Kit (DDK)
Cause
This issue occurs because the legacy filter driver cannot process requests from object identifiers (OIDs) that are related to the new power management features. Therefore, the NDIS driver disables these features.
Resolution
To fix this issue, install the update that is described in Microsoft Knowledge Base (KB) article 2719857. For more information about KB 2719857, click the following article number to view the article in the Microsoft Knowledge Base:
2719857 You cannot use an USB RNDIS device to connect to a 3G or 4G network in Windows 7 or in Windows Server 2008 R2After you install the update, the power management features that are listed in the "Symptoms" section are not disabled even though a legacy filter driver is installed on the computer.
Prerequisites
To apply this hotfix, you must be running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1. For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
For more information about NDIS driver types, go to the following Microsoft website:
General information about NDIS driver typesFor more information about power management for network devices in Windows 7, go to the following Microsoft website:
General information about power management for network devices in Windows 7For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684Description of the standard terminology that is used to describe Microsoft software updates
