I can successfully connect to a specific Oracle database if I use SQL-Plus to connect (version 220.127.116.11.0). I can also successfully connect to that same database if use Toad (version18.104.22.168). But, when I try to create the same connection via Oracle SQL Developer (version 3.2.20.09) , the specific database is not in the drop-down list of databases from which to choose if I choose a connection-type TNS. Lots of other databases are in the drop-down, but not the "target one" I'm looking for.
I verified that the database-name is correctly set up in my tnsnames.ora file, and I verified that my Windows TNS_ADMIN environment-variable does have the correct path to that file.
What am I missing?