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If you want to avoid having to customize tnsnames.ora files on every client and use a centralized approach instead,
you should use "directory naming".
While using a tnsnames.ora file on a CIFS share is not something I would do for a production system,
it should work. What problems do you encounter?
While in ODBC Data Source Administrator. When I attempt to create a new System DSN using the Oracle in instantclient_11_2 driver. The test connection fails with the following error: Unaable to connect SQLState=08004 [Oracle][ODBC][Ora]ORA-12154: TNS:could not resolve the connect identifier specified.