I am getting the http error1 :405:MethodNotAllowed error after selecting a file. I am getting the error in both IE and Chrome (have not tried other browsers).

Here is my ASPX code, which is put inside an UpdatePanel.

                    <CuteWebUI:UploadAttachments InsertText="Attach" runat="server"
                        ID="Attachments" MultipleFilesUpload="true">
                        <InsertButtonStyle BorderStyle="Groove" />
                    </CuteWebUI:UploadAttachments>

The code works just fine in the built-in webserver of VS2010, but fails with the aforementioned error when deployed to an IIS 6.0 webserver.

Using Fiddler, I have traced the 405 call to  POST to the following URL:

http://servername:5278/?UseUploadModule=Dynamic&_Namespace=CuteWebUI&_UploadID=ContentPlaceHolder_AttachmentsImage_1349954243888_1&_UploadControlID=ctl00$ContentPlaceHolder$Attachments&ContextValue=!3wEWAQUgQzpcV0lORE9XU1xURU1QXEFqYXhVcGxvYWRlclRlbXAhQGyQWFMZ5unan822kkmCWZ9v5MBLw3CIZ8DsNxw7EQ!2!2&_VFN=esm-banner.png&_Addon=verify&_AddonGuid=49b5343e-1362-4fd5-a43d-1f48b4c8ed42 

Is this a problem with the Web Service Extensions in IIS 6.0? The ASP.NET 4 extensions are allowed, and the site runs fine in all other regards.

Thanks!