Oracle SQL Developer: Failure – Test failed: The Network Adapter could not establish the connection?

I am answering this for the benefit of future community users. There were multiple issues. If you encounter this problem, I suggest you look for the following:

  • Make sure your tnsnames.ora is complete and has the databases you wish to connect to
  • Make sure you can tnsping the server you wish to connect to
  • On the server, make sure it will be open on the port you desire with the specific application you are using.

Once I did these three things, I solved my problem.

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