Client Connections to Multihomed Server Not Load Balanced

This article was previously published under Q182781
This article has been archived. It is offered "as is" and will no longer be updated.
SYMPTOMS
You have a number of clients that are using TCP/IP to connect to amultihomed server that has no IP addresses on the same subnet as the clientand the clients are always connecting to the same address on the server,even though the paths to more than one of the addresses are equal.
CAUSE
When the client's NetBT layer attempts to resolve the NetBIOS name to an IPaddress, it queries the WINS server for the address of a multihomed serverand receives a list of addresses that are always in the same order. NetBTthen takes that list and sorts it, putting addresses on the same subnet (ifany) at the top, followed by addresses in the same network class, and thenany remaining addresses. It then starts at the top of this list and pingsthe first address to make sure it is valid. If it does not get a reply, itwill go on to the next address; if it does get a reply, it will use thefirst address.

The problem is that, within these three categories, the order of addressesis left unchanged from the list provided by the WINS server. This meansthat, as long as the first address in the list is online, it will be theone that is always used by every client, which does not provide for loadbalancing.

For additional information, please see the following article in theMicrosoft Knowledge Base:

ARTICLE-ID: 161425
TITLE : WinNT 4.0 SP2 Multi-Homed Computer Connection Enhancement
RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack

STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
Properties

Article ID: 182781 - Last Review: 10/07/2013 21:07:58 - Revision: 1.3

  • Microsoft Windows NT Server 4.0, Terminal Server Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
  • kbnosurvey kbarchive kbhotfixserver kbqfe kbbug kbfix kbqfe KB182781
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