oracle11g - How to establish initial connection in SQL Developer to Oracle DB instance in Windows 8.1: "username/password invalid" -


i want work in windows oracle db (oraclexe112_win32). i've installed oracle db instance on windows 8.1 machine, admin page being here: enter image description here

the listener seems working properly: enter image description here want sql developer connect db instance running, yet fail make connection: login/password enter "sysdba/oracle" (or sys/oracle or oracle/oracle or sysdba/password) no avail. "username/password invalid" prompt getting of trials: enter image description here

the hr/hr user account not yet unlocked. this post explains how it. prior neen connection. username/password need initial connection? need help.

update

the shot of env. , system variables in win 8.1: enter image description here

tns ping igor: enter image description here

the bin directory without netca: enter image description here

seems forgot default password , dont have user log in with.

connect database command line sysdba using os admin user 

sqlplus / sysdba

create self dba user 

create user igor identified topsecret;  grant dba igor;  conn igor/topsecret

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