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

Curiously, I was able to solve the same issue by doing the exact opposite move to svc's ! I had to :

1) replace the FQDN hostname in my tnsnames.ora / listener.ora files with localhost, and restart the listener service, and

2) two, I had to use "SYS as SYSDBA" as the username in the SQL Developer input textbox

to finally be able to have SQL Developer hook to my local instance.