Hi Anand,
I was not able to reproduce this with Gateway 8.1. Do you see anything in the ssg logs? When set to true you should see something along these lines below. If your case is working in reverse I would expect a setting of false would produce these entries.
com.l7tech.server.WsdlFilter: Forwarding WSDL request to '/ssg/wsdl?uri=/uri'
.com.l7tech.server.WsdlProxyServlet
A silly question, but are you hitting the same WSDL over the same port? I only ask because WSDL downloads can be enabled / disabled per port (via Manage listen ports).
What is the result of going directly to: https://<host>:<port>/ssg/wsdl with it set to True and False?
Regards,
Joe