That almost ALWAYS means that you haven't provided the proper configuration values or may have a firewall installed.
Not sure for mac but the default port is normally 1521 for Oracle so double check that.
And are you entering a hostname? If so, you didn't show it.
If you have an Oracle client make sure you can connect using that.
1433 sounds suspiciously like a MSSQL port number.
Do you have a database installed anywhere? You don't mention it.