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You may need to Enable Network Services in the 11g Database (or get your DBA to do this for you).
I think the reason being in 11g, Oracle tightened the security so users that needed to access network credentials like LDAP and Email required specific privileges granted. Unfortunately it seems you can’t grant it for the whole database, so it needs to be done for each schema/user on the database.
See the APEX 4.2 Installation Guide, Setion 3.3.8 on 'Enabling Network Services'