There is a very useful file, specially if where you work they have a ton of connections, and it is called Tnsnames.ora which is a configuration file that defines. I am evaluating Oracle SQL Developer. My tnsnames.ora is populated, and a tnsping to a connection defined in tnsnames.ora works fine. Still, SQL Developer does not.

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Note: If you are not a My Oracle Support registered user, then click Register here and follow the registration instructions. • On the main My Oracle Support page, click Patches and Updates tab. • In the Patch Search group, select P roduct or Family (Advanced).

• In the Product field, select Oracle Database. • In the Release field select the release number. For example, Oracle 11.2.0.3.0. • Click Search. • Any available patch updates are displayed in the Patch Search page.

• Select the patch number and click ReadMe. The README page is displayed and contains information about the patch set and how to apply the patches to your installation. • Return to the Patch Search page, click Download, and save the file on your system. • Use the unzip utility provided with Oracle Database 12c to uncompress the Oracle patch updates that you downloaded from My Oracle Support.