InfoPath Dev

Im trying to fill a dropdownlist based on an other one:
Departments and SubDepartments.

i followed this link: http://www.sharepoint-tips.com/2007/01/infopath-form-services-implementing.html

when i try to fill in a form it gives me an error:
Request Failed (--> securityException) on this line:

q.FileLocation = q.FileLocation + "&FilterField1=Department&FilterValue1=" + GetDepartmentValue();

and the second dropdownlist (subdepartments) is not filtered.

Any idea how to solve this? Could it just be a simple setting?

Hi -- what is the security level on your form? Under Tools / Form Options / Security & Trust -- I think it will need to be Domain to use owssvr.dll in this way.