Determine the appropriate "Security Interoperability Mode" setting.
(1) default/performance/compatibility
(1) via the Administration console, Domain Name > Security > General > Advanced > Security Interoperability Mode setting
Oracle�� Fusion Middleware Programming JTA for Oracle WebLogic Server 11g Release 1 (10.3.1), link down to 3.3.2.3, "Configuring Security Interoperability Mode"
Various
Various
Various