Run webtests under HTTPS - message 3

Hi,
some more news on the https stuff. This is what I find in the WebTestReport.xml:
 
<config>
<parameter name="protocol" value="http"/>
<parameter name="summary" value="yes"/>
<parameter name="saveresponse" value="yes"/>
<parameter name="timeout" value="300"/>
<parameter name="haltonerror" value="no"/>
<parameter name="resultfile" value="WebTestReport.xml"/>
<parameter name="port" value="80"/>
<parameter name="failureproperty" value="webtest.failure"/>
<parameter name="showhtmlparseroutput" value="yes"/>
<parameter name="autorefresh" value="false"/>
<parameter name="resultpath" value="H:\INGGertPauwels\CanooWebTest\_ING\results"/>
<parameter name="host" value="localhost"/>
<parameter name="haltonfailure" value="no"/>
<parameter name="basepath" value="null"/>
<parameter name="saveprefix" value="response"/>
<parameter name="errorproperty" value="webtest.error"/>
</config>
 
Apparently, no matter what I do, the tests get run in the http protocol after all. The problem is I don't know where this <config> tag is defined. 
Some more questions:
 
- to run tests under https, do I have to use https.xml only?
- or do I incorporate some of the targets and ant calls into webtest.xml and run that?
 
TIA
Gert