Microsoft KB Archive/169702

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XCLN: Resolve_Netbios_Names_Last Registry Entry Does Not Work Correctly

Article ID: 169702

Article Last Modified on 10/28/2006


  • Microsoft Exchange Client 4.0
  • Microsoft Exchange Client 5.0
  • Microsoft Exchange Client 5.5
  • Microsoft Exchange Client 5.0

This article was previously published under Q169702

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.


Both the Microsoft Exchange Windows 95 client and the Exchange Windows NT client provide a registry entry called Resolve_Netbios_Names_Last, which can control the name resolution process. This setting prevents the NETBIOS name from being sent out first, and allows the Microsoft Exchange Client to send the Fully Qualified Domain Name (FQDN) of the Microsoft Exchange Server computer. This registry setting can be used to improve the Exchange Client startup time. If you use this, in the Client Profile setting, for server name, you must also enter the FQDN of the Exchange server ( and NOT the server NETBIOS name.


When the Resolve_Netbios_Names_Last registry key is set to 2 (NETBIOS off), Microsoft Exchange Client resets it to 0 (NETBIOS first).


Microsoft has confirmed this to be a problem in Microsoft Exchange Client versions 4.0 and 5.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.


WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information on how to edit the registry, see the "Changing Keys And Values" online Help topic in Registry Editor (Regedit.exe), or the "Add and Delete Information in the Registry" and "Edit Registry Data" online Help topics in Regedt32.exe.

NOTE: You should back up the registry before you edit it.

Registry value:
Location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Exchange Provider
Parameter: Resolve_Netbios_Names_Last
Data Type: REG_DWORD
Value: 0 Resolve netbios names first (default)
Value: 1 Resolve netbios names last
Value: 2 Resolve netbios names off

NOTE: The value of Resolve_Netbios_Names_Last = 2 is not supported.

For more information on debugging the slow start time, see 136516, XCLN: Improving Windows Client Startup Times and 155048, XCLN: Troubleshooting Startup of Windows Client Using TCP/IP in the Microsoft Knowledge Base.

Additional query words: WINS DNS Name Resolution

Keywords: KB169702