The Network Adapter could not establish the connection

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Problem description

The Oracle server can be connected properly, but the Network Adapter could not establish the connection when connecting to Oracle remotely using Sqldeveloper. This issue may be caused by a number of reasons, and this article describes one of the solutions.

Solution Solutions

Open Net Manager. WIN7/8 system directly search the Netmanager keyword can be found. The XP system finds the Oracle directory in all Programs, Start menu, and then finds the Net Manger program in the Oracle directory. Linux/mac System Please find this program on your own.

Change the configuration of listener from localhost to 127.0.0.1, such as:

The Network Adapter could not establish the connection