Access to affected by Sophos scan engine running on ProxyAV

Solutions ID:    KB4223
Version:    1.0
Status:    Published
Published date:    12/27/2010

Problem Description

When scanning internet traffic through ProxyAV running the Sophos scan engine users will see a "decode/decompression" error when accessing My Ebay on  This problem might manifest itself on other pages.


Initial analysis of the issue shows that some objects on are improperly compressed and Sophos has an issue uncompressing these objects.  Sophos has been contacted about this issue and they plan on including a fix for this issue in the 3.16 update at the beginning of February.

Until then here are a few workarounds:

1.  Do no scan traffic from Ebay. com using the following policy:

<cache> response.icap_service(no)

2.  Change AV vendors from Sophos to McAfee or Kaspersky.

3.  In the ProxyAV management console go to Antivirus->Scanning Behavior and change the "decode/decompress error" to serve.

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