Connection problem from Internet to the backend
Question: The connection to R/3 works fine, when the Portal is used via intranet, but fails when access is done from the internet. What can I do?
From the internet connections have to be routed through a router.
One portal system can support either connection from intranet or from internet. If you want two systems to be used, depending on the scenario you must use dynamic system resolution.
Refer to Note 737742 that explains how routers should be added in the system configuration.