Microsoft KB Archive/231790

= File Sharing Operations to a Share on Local Computer May Be Slow =

Article ID: 231790

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q231790



SYMPTOMS
When you share files on a computer, and then connect to that sharepoint from the same computer, file operations such as XCOPY may be slow if TCP/IP is the protocol being used.



CAUSE
If for example you share out a directory named "test", and then connect to that share from the same computer it was shared from, the TCP/IP stack uses what is called the "loopback" interface. The use of the "loopback" interface is to prevent packets between the client and server (which are on the same computer) from actually being sent out on the network cable.

TCP/IP implements "nagling" and "delayed acknowledgment", even though the interface in this case is loopback. This can cause unnecessary delays.

More details on nagling are available in ftp://ftp.microsoft.com/bussys/winnt/winnt-docs/papers/Tcpimp2.exe



Windows NT Server or Workstation 4.0
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:


 * http://www.microsoft.com/windows/servicepacks/ -or-


 * 152734 how to obtain the latest windows nt 4.0 service pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp

Windows NT Server 4.0, Terminal Server Edition
To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



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 NT Server version 4.0, Terminal Server Edition Service Pack 6.

Additional query words: 4.00

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB231790

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