ESS in a two portal landscape

Dear Experts,
We have a two portal landscape in which we need to run ESS.  Users will enter only one portal and need to have seamless access to the ESS services running other Java Engine.  I have enabled SSO between to the two Java Engines and it works. 
Now comes the big hurdle.  If I create wedynpro iview in one portal pointing to the other J2EE app server, then it works.  But if deploy the ESS business package EPA files in one portal and try pointing SAP_WebDynpro_XSS system to the second J2EE engine containing ESS business package SCA files, then it doesn't seem to work.
Have you done anything like this before?  The webdynpro proxy iviews that come with ESS business package (EPA files) point to which system alias or they always to have to run on the same Java stack where the portal resides.

Portal and ESS WebDynpro applications can reside on different servers. I have not tried it myself, but SAP designed it this way for increased performance and scalability. Portal iViews look for the WebDynpro applications at the location specified by the system with alias SAP_WebDynpro_XSS, so make sure you assign the following properties correctly for the system SAP_WebDynpro_XSS:
WAS host name: <J2EE server hosting the ESS WebDynpro Java>:<Port>
WAS path: /webdynpro/dispatcher/
WAS protocol: http or https
Tiberiu.

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