Solutions

Why is Web access slow when the ProxyAV scans an rpm file?

Solutions ID:    KB4394
Version:    1.0
Status:    Published
Published date:    04/21/2011
 

Problem Description

All web access through the ProxySG will be slow when a client downloads  "firefox-3.6.13-2.el5.centos.i386.rpm".

"firefox-3.6.13-2.el5.centos.i386.rpm" is a compressed package which contain more than 10000 files. When the ProxyAV appliance decompresses the rpm file and performs a virus scan it is under heavy load, which causes a slowness in the ProxyAV response. 

The performance resumes to normal when the scan is completed.

Resolution

To prevent this slowness, you have a few options:

Option 1: Create policy to instruct the ProxySG to not scan rpm files as follows:


-----------------sample---------------
define condition FileExtension1
    url.extension=rpm
end condition FileExtension1

<Proxy>
    condition=FileExtension1 request.icap_service(no)
-----------------sample---------------

 

Option2 : Reduce ProxyAV setting "Maximum archive layers" value from 16 to lower number.  e.g. "1"
"firefox-3.6.13-2.el5.centos.i386.rpm"  has 3 layers of archived files and by making this change you can reduce the depth of archives that the AV engine scan within a file.

For example, if the "Maximum archive layers" value is 3, the AV engine scans files that are part of a three-embedded zipped file (zipped files in a zipped file in a zip file).
 


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