"Decompression Bug" in Early 4.0 Versions

Just wanted to through something out there that we ran across.
In AsyncOS versions earlier then 4.0.6-12 there is an issue with inbound ZIP files containing many little files.
We noticed that if a ZIP file containing thousands of small files entered the Ironport it would "hang" the system for between 1 and 3 minutes. There would be NO response at all... command line would hang, web services would hang and most importantly not further SMTP traffic would be processed.
We did have the content filters processing within ZIP files for attachment extensions.
With 4.0.6-12 this problem was resolved. And the filter threads properly.
One way we noticed this problem is because we would get "anti-virus timeout" alerts. What would happen is a message would enter AV to be scanned, and then the system would hang on one of these zip files. By the time the system started again, it was past the max timelimit for the AV and it would kick the message out as unscannable.
I have to give Ironport credit. Once they agreed this was a serious issue, it was resoved within weeks.
Thanks,
Mike

Just wanted to through something out there that we ran across.
In AsyncOS versions earlier then 4.0.6-12 there is an issue with inbound ZIP files containing many little files.
We noticed that if a ZIP file containing thousands of small files entered the Ironport it would "hang" the system for between 1 and 3 minutes. There would be NO response at all... command line would hang, web services would hang and most importantly not further SMTP traffic would be processed.
We did have the content filters processing within ZIP files for attachment extensions.
With 4.0.6-12 this problem was resolved. And the filter threads properly.
One way we noticed this problem is because we would get "anti-virus timeout" alerts. What would happen is a message would enter AV to be scanned, and then the system would hang on one of these zip files. By the time the system started again, it was past the max timelimit for the AV and it would kick the message out as unscannable.
I have to give Ironport credit. Once they agreed this was a serious issue, it was resoved within weeks.
Thanks,
Mike

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