User is getting ODBC Error 7328, this appears in the listener.log as:
Wed Oct 02 00:07:23 2019
02-OCT-2019 00:07:23 * service_register_NSGR * 1194
TNS-01194: The listener command did not arrive in a secure transport
The client is using 12c 32bit
Sqlplus and tnsping work from the client, but not the application program. There is another DB on the target that is in the same listener, but is accessible via the client.