Hi,

This happens when your HTTP request location and the site where your
InfoPath form has been published have a different domain.  For
example, if your InfoPath form is published to:

http://MySite/infopath.xsn

and you are trying to submit to:

http://BizTalkSite/ExpenseReports/BTSHTTPReceive.dll

Then you will bump to this error.  To fix it, publish your InfoPath
form to the following instead:

http://MySite.domainname.com/infopath.xsn

and configure the submit location to become:

http://BizTalkSite.domainname.com/ExpenseReports/BTSHTTPReceive.dll

Then it will work.  Since you have both forms in the same box, you may
try to use your computer name and your local domain name.  Let me know
if it works.  Thanks.

Regards,
-King Pang