Microsoft KB Archive/270923

= Windows 2000 QoS Packet Scheduler Sends Packets with Wrong Checksum on Network Adapters That Enable Hardware Checksum =

Article ID: 270923

Article Last Modified on 3/1/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q270923



SYMPTOMS
If the network adapter that is in use has hardware checksums enabled, the Windows 2000 Quality of Service (QoS) packet scheduler might send the wrong checksum in the packet. The QoS packet scheduler can become slow when IP packets use a QoS flow and filter by using traffic-control functions.



CAUSE
This problem occurs only when Windows 2000 uses a network adapter that has the RxChecksumOffload and TxChecksumOffload properties enabled.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:   File name --  Psched.sys



WORKAROUND
To work around this issue, disable the network adapter that has the RxChecksumOffload and TxChecksumOffload properties enabled.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 2.



MORE INFORMATION
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Keywords: kbbug kbfix kbwin2000presp2fix KB270923

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