Portal SSO ~ Partial Failure

Hi Experts,

We have EP 7.0 Portal with ECC 6.0 backend connection, User mapping is done from R/3 to portal. We added firewall & reverse proxy to make portal publicaly available on internet. After sucessfull login via internet when we acess WebDynPro ABAP based iviews

that connect to backend, we get Login Prompt 😔

system - EC0

client - 100

user* - blank

pwd - blank

Language - english

If we login to the Portal from inside our Intranet, SSO is seemless there is no prompt ???

Our Landscape has WebDispatcher as Load balancer with Two Instances of Portals connecting to Same ECC backend....