XCLN: Resolve_Netbios_Names_Last Registry Entry Does Not Work

The information in this article applies to:

• Microsoft Exchange Windows NT client versions 4.0 and 5.0
• Microsoft Exchange Windows 95 client versions 4.0 and 5.0

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.

SYMPTOMS

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.

CAUSE

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

STATUS

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.

MORE INFORMATION

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 Q136516, “XCLN: Improving Windows Client Startup Times” and Q155048, “XCLN: Troubleshooting Startup of Windows Client Using TCP/IP” in the Microsoft Knowledge Base.