post the belows
on server, output of the below
and post the tns on client
If you have already installed both SQL Developer and the Oracle database, then you are getting close. And if you can connect with SQL*Plus using the SYS username you are almost there! Assuming you also have provided a valid SID or Service name in the New / Select Database Connection dialog, then the most likely issue is not having changed your Role from default to SYSDBA in the drop-down list after the Connection Type drop-down.
SQL Developer Team
1. You should be able to see which services are registered with the database listener via lsnrctl status.
Message was edited by: Gary Graham
Login into the database using SQL*Plus and do a:
select instance_name from v$instance;
This will give you the correct info for SID. Go drop that value into SQL Dev and then see Gary's comment above. "... then the most likely issue is not having changed your Role from default to SYSDBA in the drop-down list after the Connection Type drop-down
If you are using tnsnames, then that name will go in Service Name box, but your error message definitely suggest the SID is wrong.