SSO for Servers in different locations

Hi SDN,

I have to configure SSO between EP 7.0 and ECC 6.0. But both the Servers are in different locations and I am different place, also I can only access each of these Servers with differents VPN IP adresses.

I can only connect any one of the Servers at a time (because only one IP can be connected through VPN at a time).

If I want to access the Backend System (ECC 6.0) from the portal, I have to use both VPNs. But it is not possible at a time, so How can I resolve this issue.

Thanks,

Vamshi