Add the following entry in your TNSNAMES.ORA file and change the values shown in brackets to suit your environment:

<addressname> =
 (DESCRIPTION =
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(Host = <hostname>)(Port = <port>))
   )
 (CONNECT_DATA =
   (SERVICE_NAME = <service_name>)
 )
)

Here is a completed example:

ORA11 =
 (DESCRIPTION = 
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.0)(PORT = 1521))
   )
 (CONNECT_DATA =
   (SERVICE_NAME = ORA12)
 )
)

TNSNAMES.ORA files are located on both client and server systems. If you make configuration changes on the server ($ORACLE_HOME/network/admin/tnsnames.ora) ensure you can connect to the database through the listener if you are logged on to the server. If you make configuration changes on the client (c:\oracle\product\12.1.0\db_1\network\admin\tnsnames.ora) ensure you can connect from your client workstation to the database through the listener running on the server.

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