Microsoft KB Archive/219285

= Load Balancing FTP with WLBS =

Article ID: 219285

Article Last Modified on 2/24/2007

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Server 4.0 Enterprise Edition
 * Microsoft Windows NT Load Balancing Service

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This article was previously published under Q219285





SUMMARY
This article explains how to load balance traffic to FTP servers using Windows NT Load Balancing Service (WLBS).



MORE INFORMATION
FTP servers use TCP port 21 for control connection and TCP port 20 for return data connection from the server. Sometimes, the server indicates to the client to use another port (above 1024) to communicate with it.

To Load Balance FTP, configure the following port rules:
 * 1) Configure a port rule with a range from 20 to 21, protocol TCP, and Affinity set to either Single or Class C (to ensure that both data and control connections are handled by the same server).
 * 2) Configure a port rule with a range from 1024 to 65535, protocol TCP, and Affinity set to either Single or Class C.

For additional information about how to configure port rules, please see the following article(s) in the Microsoft Knowledge Base:

198496 How to Configure WLBS Port Rules

Additional query words: convoy balancing

Keywords: kbinfo kbnetwork KB219285

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