Article ID: 276253 - Last Review: February 21, 2007 - Revision: 5.3 Back-to-Back Queue Full Problem in Scsiport.sysThis article was previously published under Q276253 SYMPTOMS
If the SCSIPort driver encounters multiple busy or queue full request completions, it attempts to requeue requests in the logical unit's Device queue. When this occurs, the SCSIPort driver expects to find the Device queue in a busy state. However, it is possible for the queue to be in a not-busy state if it was drained by delivering LuNextRequests to the miniport driver. When this error occurs, the SCSI bus resets.
RESOLUTIONA supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows 2000 service pack that contains this fix. To resolve this problem immediately, download the fix by clicking the download link later in this article or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS
(http://support.microsoft.com/default.aspx?scid=fh;en-us;cntactms)
NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.The following files are available for download from the Microsoft Download Center: Collapse this image  Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image Collapse this image 119591
(http://support.microsoft.com/kb/119591/EN-US/
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How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
The English version of this fix should have the following file attributes or later:Date Time Version Size File name ------------------------------------------------------ 10/13/00 02:26p 5.00.2195.2487 72,432 Scsiport.sys STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. MORE INFORMATIONFor 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
(http://support.microsoft.com/kb/249149/EN-US/
)
Installing Microsoft Windows 2000 and Windows 2000 Hotfixes
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