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I am using OS/X 10.8.5. I have SQL Developer and Instant Client 11.2 installed and working fine.
I have recently installed Oracle Data Modeler 220.127.116.117 and am trying to synchronize my model with the DB.
When I try and add a connection if I set the connection type to TNS (which works just fine in SQL Developer), it doesn't show any of my tnsnames.ora entries in the 'Network Alias' drop down.
So I instead tried creating a connection of type 'Basic'. That _seemed_ to work OK - in that when I clicked 'Test' on the connection it returned success. However when I tried to use that connection it returned immediately with the error 'Closed Connection'.
Any suggestions would be gratefully received.