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I keep getting this error in my event viewer on IIS 6. I'm trying to figure out if my error resets my connection (maybe recycles the worker processes?).

The error is:

An attempt was made to load filter 'C:\Program Files\Software Artisans\FileUp
\FileUpIsapi.dll' but it requires the SF_NOTIFY_READ_RAW_DATA filter notification and 
this notification is not supported in Worker Process Isolation Mode.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink
/events.asp.
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Can you check IUSR has read/write to that folder? Sounds like a permissioning issue. –  Chris Anton Jun 13 '12 at 17:16
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1 Answer

Looks like your ISAPI filter is not compatible with IIS6 Worker Process Isolation Mode. It sounds like it was written for IIS5.x.

For more information see this Microsoft KB article:

Information about ISAPI filters that register the SF_NOTIFY_READ_RAW_DATA event in Internet Information Services version 6.0

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