ORA-12505, TNS:listener does not currently know of SID given in connect des

Question

Please kindly help me as I just installed Oracle 11g but cannot connnect using SQL Devloper using the settings below:

Username: system

Password: mypassword

Answer 1

If you Still getting this Error message:

Status : Failure -Test failed: Listener refused the connection with the following error:

ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

Do following steps: 1. open cmd prompt. 2. c:/ services.msc 3. its navigate to system services console there it self once you check it the OracleServiceXE status. 4.then starts the service status(rightclick>start) wait till status showing the running.