SQL Developer wont work via SSL (TCPS)

Question

I am trying to get SQL Developer (1.5.1) to connect to our Oracle database using SSL (tcps -- port 2484) and am getting a very generic error. (I have no error connecting to the same database over the unencrypted port -- 1521).
Status: Failue - Test failed: Io exception: The Network Adapter could not establish the connection.
I personally think that the connection is timing out, but all logging/debuggig features I can find do not prove anything either way. I have successfully connected to the database via SSL using tnsping and sqlplus. I have also successfully imported the certificate from the database server into the cacerts file in sqldeveloper/jdk/jre/lib/security This error is the same whether I use my TNSNAMES file or a custom JDBC url.
Please reply if you have questions/ideas/solutions.
Thanks, Dan
block from TNSNAMES.ora
TEST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = hostname.fqdn)(PORT = 1521))
(CONNECT_DATA =
(SID = test)
TEST_SSL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCPS)(HOST = hostname.fqdn)(PORT = 2484))
(CONNECT_DATA =
(SID = test)
(SECURITY =
(SSL_SERVER_CERT_DN="CN=hostname.fqdn, OU=My Unit, O=My University, L=City, ST=State, C=US")
contents of sqlnet.ora
SQLNET.AUTHENTICATION_SERVICES= (BEQ, TCPS, NTS)
SSL_VERSION = 0
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
SSL_CLIENT_AUTHENTICATION = FALSE
WALLET_LOCATION =
(SOURCE =
(METHOD = FILE)
(METHOD_DATA =
(DIRECTORY = C:\oracle\certs)
)

Answer 1

This has helped, but I am not 100% there.
After altering my setting to use OCI/Thick driver and upgrading to 11g client, (and verifying that I could sqlplus/tnsping/odbc as before) the following happens:
When testing the connection or trying to connect with tnsnames method, the dialog box comes up just telling me it's testing/connecting, and never stops trying (and therefore also never fails).
This also happens when I try to connect via a custom JDBC URL,
BUT
When I test the connection using the same JDBC URL, I 'succeed' -- so I must be close.
My Custom JDBC URL is
jdbc:oracle:oci:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)
(HOST=hostname.fqdn)(PORT=2484))(CONNECT_DATA=(SERVICE_NAME=test))
(SECURITY =(SSL_SERVER_CERT_DN="CN=hostname.fqdn, OU=My Unit, O=My University, L=City, ST=State, C=US")))
What might I be missing?
Thank you.