first of all thanks for your prompt response, also thanks to solve the issue.
i have oracle client installed, i can connect to users other then sysdba ,
however after disable the parameter (as mentioned in step 3), issue has been solved. once again many thanks.
Regards
Adnan Rafi
Hi,
I am not able to connect as sysdba user because of connect as filed is disappeared from login screen.
re-installing the software didn't solve the problem,
check following link for login screen
https://docs.google.com/file/d/0BwkKGcK41ZzkTDNxTEZZNGhLamc/edit?usp=sharing
Regards
Adnan Rafi