There is some additional code to setup ACLS in 11g, this example was done in 220.127.116.11
From SUNGARDHE FAQ 1-4W1JEA – Banner and Oracle Database 11g FAQ
Instructions followed on how to setup a network ACL…but you may encounter an error while following their example.
ERROR at line 1:
ORA-31001: Invalid resource handle or path name
ORA-06512: at “SYS.DBMS_NETWORK_ACL_ADMIN”, line 384
ORA-06512: at line 2
Add a drop acl command before running either the add privilege or create_acl commands….the following worked for me. The acl name has to match, in this example provided by SunGard it is called mailserver_acl.xml.