DOCUMENT:Q216091  11-JUN-2002  [winnt]
TITLE   :GetHostByName() Returns IP Address of Disabled Interface
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:4.0 SP4
OPER/SYS:
KEYWORDS:kbWinNT400sp5fix

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The information in this article applies to:

 - Microsoft Windows NT Server version 4.0 SP4 
 - Microsoft Windows NT Server, Enterprise Edition version 4.0 SP4 
 - Microsoft Windows NT Workstation version 4.0 SP4 
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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-

 - Q152734 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/default.aspx?scid=fh;EN-US;CNTACTMS

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 this to be 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

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Keywords          : kbWinNT400sp5fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400search kbWinNT400search kbWinNTW400sp4 kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400sp4 kbWinNTS400sp4 kbWinNTS400search
Version           : winnt:4.0 SP4
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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