DOCUMENT:Q171567  09-AUG-2001  [winnt]
TITLE   :Windows NT 4.0 ServiceProvider Priority Values Not Applied
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:4.0
OPER/SYS:
KEYWORDS:kbnetwork

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The information in this article applies to:

 - Microsoft Windows NT Workstation version 4.0 
 - Microsoft Windows NT Server version 4.0 
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SYMPTOMS
========

You may notice that changing the ServiceProvider priority values, as specified
in Knowledge Base article Q139270, "How to Change Name Resolution Order on
Windows 95 and Windows NT," does not change the hostname resolution order as
expected.

CAUSE
=====

Unlike Windows NT 3.x, Windows NT 4.0 does not implement the ServiceProvider
priority values.


RESOLUTION
==========

Contact Microsoft Technical Support to obtain the updated files mentioned below.

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 4.0. A
supported fix is now available, but has not been fully regression-tested and
should be applied only to systems experiencing this specific problem. Unless you
are severely impacted by this specific problem, Microsoft recommends that you
wait for the next Service Pack that contains this fix. Contact Microsoft
Technical Support for more information.


MORE INFORMATION
================

In the fix mentioned above, Microsoft has added a new registry value to the
TCP/IP service that allows an administrator the option of changing the hostname
resolution order. By default, hostname resolution is performed by Domain Name
Service (DNS) first, followed by NetBIOS over TCP/IP (NetBT), if DNS fails. With
the use of this registry value, the order of hostname resolution can be
reversed.

WARNING: Using Registry Editor incorrectly can cause serious, system-wide
problems that may require you to reinstall Windows NT to correct them. Microsoft
cannot guarantee that any problems resulting from the use of Registry Editor can
be solved. Use this tool at your own risk.

To change the hostname resolution order (between DNS and NetBT name resolution
mechanisms), perform the following steps:

1. Run Registry Editor (Regedt32.exe).

2. Go to the following key in the registry:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

3. On the Edit menu, click Add Value and enter the following value information:

      Value Name: DnsNbtLookupOrder
      Data Type:  REG_DWORD
      Value:      1 or 0 (default=0, value of 1 causes NetBT name
                  resolution to be attempted before DNS)

4. Exit the Registry Editor and restart the computer for the change to take
   effect.


Additional query words: 4.00 multihomed

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Keywords          : kbnetwork 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : winnt:4.0
Issue type        : kbbug
Solution Type     : kbfix

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