There are various way to make Webcenter Portal Single Sign-on work.
- Oracle Access Manager (OAM)
- Oracle Single Sign-on (OSSO)
-SAML-based single sign-on solution for Oracle Webcenter Portal Applications Only
- SSO Solution for Microsoft Clients, using Window Authentication based on the Simple and Protected Negotiate (SPNEGO) mechanism and the Kerberos protocol.
Oracle OAM 11G is the recommended single sigh-on solution for Oracle Webcenter Portal 11g Installations.