Microsoft KB Archive/216091

= GetHostByName Returns IP Address of Disabled Interface =

Article ID: 216091

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q216091



SYMPTOMS
In Windows NT 4.0, it is possible to set up multiple hardware profiles using the Devices tool in Control Panel. The device for the network interface card (NIC) can be disabled on a per-profile basis.

In such a scenario, Sockets-based applications running on Windows NT 4.0 Service Pack 4 may fail unexpectedly. This problem has been observed in NetShow and Microsoft Exchange applications. The problem can also occur on multihomed computers where one of the NICs is disabled.



CAUSE
This problem occurs because the GetHostByName API returns the old IP address owned previously by the disabled NIC.



RESOLUTION
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

This hotfix has been posted to the following Internet location as Rnr-fixi.exe (x86) and Rnr-fixa.exe (Alpha):

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postsp4/rnr-fix/



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 Service Pack 4. This problem was first corrected in Windows NT version 4.0 Service Pack 5.

Additional query words: 4.00 sp4

Keywords: kbbug kbfix kbqfe kbhotfixserver KB216091

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