Invalid Content-Type:text/html. Is this an error message instead of a SOAP response?)

We are setting up our integration to HP Service Manager.  We have our AP webservices fronted by IIS in order to enfoce SSL as well as in our prod environment let the webservcies be load balanced along with the user interface. 

It HP Service Manager  in the AlarmPointConfig if we use:

https://our.host.name/api/services/AlarmPointWebService

We get the notorious INVALID_WEB_SERVICES_VERSION

So following the instructions from this site and the consultants we are working with, we changed it to use

https://our.host.name/api/services/xmatters-4.1.6

SM gets an error:

Error calling method: doSoapRequest in class:com/hp/ov/sm/server/utility/SoapClient Exception (com.sun.xml.messaging.saaj.SOAPExceptionImpl: java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Invalid Content-Type:text/html. Is this an error message instead of a SOAP response?)

I am trying to track this down, is the xmatter-4.1.6 not giving the valid content type for SOAP?