Post to callback function fails (was 405)

if i initiate the checkout process the response to my
callback fails
on IIS 6 with 405 verb not allowed, however if i do the
following from
my local pc (not logged on to the windows network)

<CFHTTP URL="http
s://www.mysite.com/google/callback.cfm"
METHOD="post"
THROWONERROR="Yes"               
TIMEOUT="30" PORT="443"
USERNAME="my-
merchand-id"  PASSWORD="my-merchand-key">
	  <CFHTTPPARAM NAME="test" VALUE=""
TYPE="FormField" ENCODED="YES">
</CFHTTP>

the response from then webserver is:

Connection 	close
Content-Type 	text/html; charset=UTF-8
Date 	            Wed, 19 Dec 2007 21:42:20 GMT
Explanation 	OK
Http_Version 	HTTP/1.1
Server 	Microsoft-IIS/6.0
Status_Code 	200

this makes me believe the problem is in the data sent not
the
configuration of the webserver.
can someone from google provide sample response code to help
me find
the problem?
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