ABAP WebDynPro iView: Session remains open in backend.....

Hi Experts,

We have configured ABAP Webdynpro (SD Order Creation) iView in SAP Portal. When we test it from intranet, everything works fine and session in backend gets terminated when we leave that page on portal. But when we test it from internet, session remains open and not getting closed. How to terminate these onen sessions??

SAP Portal and backend SAP ECC are on same domain....

Helpful answer will be respected.....

Thanks

PRAMOD