Hello Michael Chan Fong,
It seems that in the IIS6 configuration, the requests are not going through our sf404 page - otherwise the form action would contain the sf404.
Can you please make sure that these request does indeed go to Asp.Net? What kind of 404 error are you getting, is it coming from IIS, or from Asp.Net?
Thank you in advance for any additional information that you can provide.
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