"Proxy Chain Loop" Error Message Using Proxy Server and NLB

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This article was previously published under Q269165

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SYMPTOMS

After you install Network Load Balancing (NLB) with Proxy Server 2.0, you may receive the following error message in your browser:

Error 12206 proxy server has detected a proxy chain loop

You may also notice in Task Manager that the Inetinfo.exe process has high CPU usage.

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CAUSE

The NLB virtual IP address is being used for intra-array communications. All array traffic is load balanced and may end up being routed back to the Proxy server from which it was sent.

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RESOLUTION

Configure intra-array communications to take place over the dedicated IP address:

In IIS Internet Services Manager, right-click Web Proxy, and then click Properties.
Click the Routing tab, and then click Advanced in the Routing Within Array section.
Modify the Intra-Array Communications section to reflect the dedicated IP address of the Proxy server. You can type this information manually, or click Auto-Detect to see all the available IP addresses.
Click OK, and then click OK.

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MORE INFORMATION

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

238524 (http://support.microsoft.com/kb/238524/EN-US/ ) Using Cache Array Routing Protocol with Windows NT Load Balancing Service

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APPLIES TO

Microsoft Proxy Server 2.0 Standard Edition
Microsoft Windows NT Load Balancing Service

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kbnlb kbprb KB269165

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Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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