Connection error, Oracle state: failure - test fails: IO error: The Network Adapter could not establish The connection

This error is that the network adapter cannot establish a connection, the mistakes because the lack of an ORACLE listener service didn't open.

Operation:
Open the desktop of the computer, right management, open computer management, services and applications to open on the bottom of the find, and then open the service, on the right find ORACLE the corresponding service, you can see the ORACLE listener service is not open, we can with the right mouse button to start the

Finally we can see success to test, then can normal connection