Symptoms

Consider the following scenario:

  • You have a server that is running Microsoft Internet Security and Acceleration (ISA) 2006.

  • Internal clients use ISA 2006 as their outgoing firewall.

  • Internal clients use Socks V4 to connect to an Internet resource through the ISA 2006 server.

  • A Socks V4 internal client has to download a large file from the Internet resource, for example, by using FTP protocol.

In this scenario, the large file that is downloaded by the client is corrupted.

Cause

There is a problem in the Socks V4 application filter that is included together with ISA 2006. This issue does not occur when you use a third-party Socks V5 application filter.

Resolution

To resolve this problem, install the ISA Server 2006 hotfix rollup package that is described in the following Microsoft Knowledge Base article:

2616326 Description of the ISA Server 2006 hotfix package: September 2011

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