Single Sign On after Systemcopy dosn´t work

Hello,

i have a problem with single sign on.

What we did. We installed a new testportal (EP 6.0 SP 15) with a Systemcopy from our old testportal.

Every thing works fine, but only single sign on dosn´t work.

We deleted the old SSO Ticket in the SAP-Backend-System and imported the new SSO Ticket (from the new testportal) into the SAP-System.

The result is: From the old portal Single Sign on works. But from the new portal i get the SAP-Login-Screen.

What can i do?

Thank you

Martin