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Event ID: 23004 Source: MicrosoftISAServerWebProxy

Level
Description
ISA Server was unable to process a response body from <web site>. The server supplied a compressed response although ISA Server did not request compression. The response was discarded.
Comments
 
This issue occurs if the user tries to access a Web site that sends compressed HTTP responses and ISA Server 2004 is configured not to request compressed HTTP responses from servers. See ME915422 to solve this problem.
This issue is by all means in relations with ISA SP2, but it can be resolved by configuring HTTP compression. See the link below for details.
This behavior appears to be a known bug in ISA 2004 SP2 affecting several major sites. Microsoft is reportedly (3/8/06) working on a hotfix for this issue. The root cause is ISA not recognizing compression methods other than gzip. This is rumored to also be affecting ITunes Store access.

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