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 u r using oracle 11g enterprise edition, then do one thing, u just uninstall it, and again reinstall oracle 11g. do all the steps carefully. when installation will finish, then go to start menu-oracle 11g-configuration & migration tool-database configuration assistance. open this & again do configuration here u will give a sid name . that sid will be used when u will create a connection in sql developer insteade of xe. execept this above dont change other. i hope it will be definitely work.