SQL Developer Data Modeler

Hello everybody!!

I´m a Spanish guy who is starting in the world of databases. This is my first year studying and I´ve always used SQL Developer on Windows but now I would like to use it on Mac.

I have installed the SQL Developer but when I try to create a new connection I get an error message, it says something like:

_"Error de E/S: The Network Adapter could not establish the connection"_

But is very strange for me because in Windows when I want to create a new connection, first of this, I have to create a new user in the SYSTEM connection, but now in Mac this connection (SYSTEM) doesn´t exist.

There are a lot changes between Windows´s version to Mac´s version.... can anyone help me please??

Thanks for your attention and excuse me for my English hehe!