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Failure -Test Failed: IO Error: The Network Adapter could not establish the connection

After installing the Oracle 12c, I have created the new schema(s). Once I created the schema also installed the Oracle Sql Developer.
I created the new connection but I am not able to connect through the Oracle sql developer. I am able to connect through sqlplus.
while try to connect through the oracle sql developer am getting the error. 
lo exception: The Network Adapter could not establish the connection

Solution

$ sudo systemctl stop  firewalld

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