For TNS connections looks like the most current Oracle client is being asked for these days. The 12.2.0.1 client still works fine though I get the below error.
Testing the Oracle Home located at C:\Southern\Oracle\ora12.2\client_1
Testing client directory ... OK
Testing loading Oracle JDBC driver ... OK
Testing checking Oracle JDBC driver version ... Failed:
Minimum driver version 21.0 required, specified driver version is 12.2.0.1.0
Don't thinks its always feasible in the real world to expect someone with lots of users to be running on the latest client.
sqld.doc (4.81 MB)