Why the status failed while creating a new connection? - oracle-sqldeveloper

I am using Oracle SQL developer. When I am trying to create a new connection, I am getting the following error.
"Status: Failure-Test failed: IO Error: The Network Adapter could not establish the connection"
But, I am succeeded in creating new connection by editing the properties of the already existing connection.
Why it throws an error while trying the formal way?

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