unknown messageExchange type in security test

Hello,
I notice that a lot of my security tests return this error in the security log

example:
[Invalid Types] Request 5 - FAILED - [format=12.45E+12]: took 105 ms
-> Unknown MessageExchange type

[SQL Injection] Request 34 - FAILED - [releaseid=/*!10000 1/0 */]: took 94 ms
-> Unknown MessageExchange type

What does Unknown MessageExchange type imply ? I don't see anything in the response (rest service) that looks odd.

Here is the raw response below
HTTP/1.1 200 OK
Cache-Control: public
Content-Length: 8867
Content-Type: application/xml; charset=utf-8
Server: Microsoft-IIS/6.0
Server: : TUL1CSSW1
X-Powered-By: ASP.NET
X-AspNet-Version: 4.0.30319
Date: Fri, 17 Jun 2011 02:20:02 GMT

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Ali