Oracle DB connection failed and throwing “Error 27502. Could not connect to Oracle"

Hi,

In my project, I’ve configured oracle connection properties in ISSQLDBMetaData table.

AdoDriverName: OraOLEDB.Oracle
AdoCxnDriver: Provider=
AdoCxnServer: Data source=
AdoCxnUserID: User Id=
AdoCxnPassword: Password=
AdoCxnWindowsSecurity: OSAuthent=1

In SQL-login dialog, I’ve selected oracle Alias name which I’ve added this entry in ‘tnsnames.ora’ file. The DB Test connection got success and moved to next dialog.
But, While execute SQL scripts section, it’s trying to connect oracle server and throwing below error message.

Error 27502. Could not connect to Oracle ' '. ORA-12560 : TNS : protocol adapter error (12560)

I’ve tried “AdoCxnServer: Dbq= “ also. Its throwing same error.

Note:
I’ve installed Oracle 11g and Oracle instance client 11.2.0.3.0
Its working fine in InstallShield 2011 PE version.

If its a oracle connection problem, it should throw this exception in SQL-login dialog.

Could you please help me.