How to post data to DLL

Question

Hello,

        i have use following code in my .aspx page.
 
        i need to post data to https://secure.authorize.net/gateway/transact.dll .

        this code is working fine from my local server.

        bat when i upload this page on my live server.so this page is redirecting to himself and data not posting to that DLL.

        if any one know about it please check this code and give me the solution .

       <form id="simForm" runat="server" method='post'  action='https://secure.authorize.net/gateway/transact.dll'>

                     <input id="HiddenValue" type="hidden" value="Initial Value" runat="server" />
                     <input type='hidden' runat="server" name='x_fp_sequence' id='x_fp_sequence' />
                     <input type='hidden' runat="server" name='x_fp_timestamp' id='x_fp_timestamp' />
            <input type='submit' runat="server" id='buttonLabel' />

      </form>