Recevie POST data from 3rd party, 500 Error in IE

No problem with Firefox and Opera

[iProgram]

I have a script on my own server which has only one line:

<?
echo "Order Number:" . $_POST['order_number'];
?>

This script is used to receive passback data from 3rd part script. (2checkout.com payment gateway h**ps://www2.2checkout.com/2co/buyer/purchase)

When a customer places an order at 2checkout order form, 2checkout will process this order and POST data to my script. I can place test order on 2checkout server to see if it works or not.

The problem is, the script works fine if I use FireFox or Opera. But when I use IE, I will always get HTTP 500 error when 2co posts data to my script.

What's wrong with my server/script or IE? I also asked some others to test this for me(under Xp, XP SP2 or Win2000), they also get 500 error in IE. Only one guy who uses Windows 2003 can get the right page in IE.

[jatar_k]

I have to say, I am not really sure why that would be.

have you tried anything else to maybe give some extra clues?

[iProgram]

I already know the problem. IE's bug.