Hi everyone,
as I read through as couple of threads concerning the above mentioned topic, I never found a solution for it.
What I know is that I have to export the certificate and import it into the Portal. A cookie can then be created which realizes the authentication at the Portal.
The ticket has to be created for the whole domain if the portal server is located in a different domain.
What has to be done that the Portal accepts tickets from a R/3 bckend?