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The tnsnames.ora file has an entry for the service alias ORCL as follows: ORCL ( DESCRIPTION (ADDRESS = (PROTOCOL = TCP)(HOST = 10.156.24.216)(PORT = 1521)) (CONNECT_DATA (SERVER = DEDICATED) (SERVICE_NAME = orcl.oracle.com) ) ) The TNSPING command executes successfully when tested with ORCL, but you are not able to connect to the database instance with the following command: SQL> CONNECT scott/tiger@orcl What could be the reason for this?