Windows Sockets 2.0 Does Not Use DnsNbtLookupOrder Value (216470)

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

With Windows Sockets 2.0 (Winsock 2) installed, the registry entries for controlling name resolution order have no effect. Name resolution is carried out first using DNS and then using NetBIOS, even if the DNS resolution is successful.

Note that Winsock 2 is optional in Windows 95, which is initially configured with Windows Sockets 1.1, but is the default in Windows 98.

RESOLUTION

A 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 Microsoft Windows 98 service pack that contains this hotfix.

To resolve this problem immediately, 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

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 typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

All localized versions of this fix should have the following file attributes or later:

   Date     Time    Version      Size    File name   Platform
   ------------------------------------------------------------
   03/03/99 2:59pm  4.10.2002    44,032  Rnr20.dll   Windows 98
   05/23/99 5:02pm  4.10.1662    43,520  Rnr20.dll   Windows 95

MORE INFORMATION

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

The registry control specified and provided for in the Windows NT implementation is:

Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP
Value: DnsNbtLookupOrder
Type: DWORD
Notes: 0 = DNS first, 1 = NBT first

NOTE: If the value is not in the registry, DNS is queried first.

For additional information about Winsock 2 and Windows 95, please see the following article in the Microsoft Knowledge Base:

182108 Availability of Windows Sockets 2.0 for Windows 95

For additional information about registry entries and Windows Sockets, please see the following articles in the Microsoft Knowledge Base:

158474 Windows TCP/IP Registry Entries

170619 Windows 95 ServiceProvider Priority Values Not Applied

For additional information about Windows 98 and Windows 98 Second Edition hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

206071 General Information About Windows 98 and Windows 98 Second Edition Hotfixes

For additional information about Windows 95 hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

161020 Implementing Windows 95 Updates