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Zip File Size between 9-10 MB is Dropped Due to AV Scanning

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Article ID: KB8076 KB Last Updated: 02 Sep 2011Version: 4.0
Summary:
Downloading a zip file that is less than the max content size may be dropped in some situation when AV is enabled.
Symptoms:

Environment:

  • AV enabled
  • Zip file is 9.79 Mbytes, but the max content size specified is 10 Mbytes

Symptoms & Errors:

  • Zip file is dropped due to exceeding max content size, but the zip file is less than the max content size specified.

Solution:

If  trying to download a compressed archive, like zip, gz, tar, that is just less than the max content size, in some situations  the download may not complete.  When ScreenOS scans for zip files, it has to first decompress the file.  If, after decompressing, the resulting file is greater than the max content size, the file will be dropped.


The event will be logged; sample below:

AV Content from x.x.x.x:xxxx -> y.y.y.y:yyyy, http url: www.aaa.com/file.zip is dropped since max content size is exceeded

For example, assume the max content size is set to the default 10 Mbytes and the zip  file to be downloaded is 9.79 Mbyte  zip.  After decompression, the result of the file will be > 10 Mbytes; thus the max content size is exceeded.

If you want zip files of this size to be passed, then apply the command:

unset av scan-mgr max-content-size drop

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