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
  • Can you check IUSR has read/write to that folder? Sounds like a permissioning issue. Jun 13, 2012 at 17:16

1 Answer 1


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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