When concern team try to connect to the database and getting below error or the below error has been encountered during DBA activity.
The possible reason for this
1.- you have either the wrong SQL Developer URL
2.- The wrong port number or IP address (or DNS host name) was used
3.- The listener is not configured properly
4.- The listener process (service) is not running. You can re-start it with the "lsnrctl start" command or on Windows by starting the listener service.
5. Port is closed.
In my case the port was closed reached to firewall team to open the port.Generally this reason is very rearly encountered because port is already enabled. But in my scenario it was a newly build database.
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