How to implement iview for gui of windows ?

Hi all.

We are implementing the single sign on, integrate with EP with SAP R/3.

We create ivew for gui of windows.

When we sign in the EP, we click on the iview, inside iview, there is a window gui of sap gui.

Now we meet with the error ' Issuer of SSO ticket is not authorized.

We want to how to implement it using ticket authoration method. Whats the detailed steps ?

Thanks a lot, its very urgent.