if you don't specify a fully qualified name for BI4 App Server, EP may assume that not all the machines are on the same DSN domain, resulting in the following error when trying to view the report through the BOE iView "Session Manager will not work§ Please check DSM log for details"
If you get this message, the SSO does not work and you will be prompted for your user ID and password.
You need to sort down the FQDN issue before go thorough the SSO issue.