iPhone app image uploading to ASP.NET site directory

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IIS7

ASP.NET

IIS

I have an asp.net website that requires the user to upload photos. This can be used on iOS iPhone and iPad systems except of course input controls will not work on their SAFARI browsers. So we are testing an iPhone app call picup to upload images to the server. This works by suppling a parameter (postULR) on which the app will POST images. If we use the default server (picupapp.com) all works fine. If we use our own server, the upload is incomplete, and the error code returned from the server is:

http error 405 verb used to access this page is not allowed.

The websever is 2008 using iis7. Looking at the event handlers I cannot see any relevant handler that does not allow the POST event. But I do not know what Handler iOS iPad apps will use to POST to the server, all I know is it does not work.
All of the posts I have seen point to looking at the *.html handler, and the iis in our server does not have this extension on any handler.

I know our own server is restricting the POST, but what handler and why; and how do you put it right? Any one have any idea whats going on?