IWSVA may trigger a detection for any of the following reasons:
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A virus, Trojan, worm, spyware file, etc. was detected
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The file was password protected, encrypted, or corrupt (unreadable)
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The file was compressed, and Block Compressed files is selected (HTTP > HTTP Malware Scan > Policies > [policy name] | Virus Scan Rule page)
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Compressed file contains too many layers compression
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Decompressed file size will be too big
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The decompression ratio of any file contained in the compressed archive exceeds the
limit set
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number of files contained in the archive would have exceeded the set limit down
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User has exceeded his/her bandwidth quota
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The file exceeded the specified maximum file size: (HTTP > HTTP Malware Scan > Policies > [policy name] > Virus Scan Rule)
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The client connection timed out
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One of the IWSVA pattern files contains an error (rollback to previous version)
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IWSVA installation topological is incorrect (traffic routing problem)
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Web traffic is turned off in the Summary page