When the 'sortAscending' is commented out, i get the no property error:
SOAP-ERROR: Encoding: object has no 'sortAscending' property"
<s:element minOccurs="1" maxOccurs="1" name="sortAscending" type="s:boolean" />
sortAscending is a mandatory field in wsdl, that's why you are getting above error.
When it is uncommented I get the following error:
message: Could not connect to host
faultcode: http
There is no fault in your request soap message here. The issue here is, this end point url.
http://www.zulutrade.com:81/WebServices/Performance.asmx
It is not accessible. Connect with your wsdl provider regarding this. you can not do anything about that. Most probably, this srvice would be hosted on some other port rather than 81.