Thanks Meghal for the helpful response
The HTTP Security Session Management was incative in backend and not checked (set to 'no') in portal. /sap/public/bc/icf/logoff was also inactive. This was allowing the sessions to terminate when logging out but not when moving from an iview to an iview. This scenario worked fine in previous versions.
I have tested other combinations but with no successfully outcomes:
Portal = N , Backend = Inactive, /sap/public/bc/icf/logoff = Active
Portal = Y, backend =Active, /sap/public/bc/icf/logoff = Active. Now doesnt even work when logging out.
Portal = N , Backend = Active, /sap/public/bc/icf/logoff = Active or Inactive the same as above.
I have done the test on another installation of SPS7 portal and it is the same there. So cant be a back-end issue.
Regards,
Haik