Thanks Sam,
As you mentioned HTTPS is having issues.
Following are details based on analysis by our MII Team.
Issue is with xmla service and port.
Service URL is having port 443 and endpoint is having different port (8443) because of network setup.
If we modify endpoint port to 443 than its working fine in SOAPUI, so we are assuming this will work into OLAP also after having correct port in endpoint.
Meanwhile we implemented http post to replace OLAP.
Thanks & Regards,
Manoj Bilthare