I have just downloaded and extracted the Oracle SQLDeveloper in MAC OS X. Until then, when I am establishing a connection using the HR (default) as the username and password, ORCL for the SID... the test result always show "test failed the network adapter could not establish the connection". Any insights...
regards prinsipeluha
Your Host or Port entry is not correct and/or your host is not accessible from your machine (e.g. behind a firewall). If localhost the defaults would be
host: localhost
port: 1521
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