Vendor code 17002 to connect to SQLDeveloper


When i tried to connection to Oracle DB Connection using SQL Developer, I got the following error 

Vendor code 17002 to connect to SQLDeveloper 

1.      Press Windows+R
2.      Type services.msc and strike Enter
3.      Find all services
4.      Starting with ora start these services and wait
5.      Then shut down the SQL Developer and re-start it otherwise it will generate another error 
An error was encountered performing the requested operation: Listener refused the connection with the following error: ORA-12505, TNS:listener does not currently know of SID given in connect descriptor Vendor code 12505


Hope this helps :)

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