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

Question

Problem

Please note that I changed details for security purposes. However, the problem remains intact.

I installed an Oracle 11g database on a server at l

Answer 1

For me, the HOST was set differently in tnsnames.ora and listener.ora. One was set to the full name of the computer and the other was set to IP address. I synchronized them to the full name of the computer and it worked. Don't forget to restart the oracle services.

I still don't understand exactly why this caused problem because I think IP address and computer name are ultimately same in my understanding.