Document updates.

Author: anthony-tuininga

doc/src/user_guide/appendix_a.rst

@@ -110,7 +110,7 @@ see :ref:`driverdiff` and :ref:`compatibility`.
       - No
       - Yes - No TIMESTAMP support
       - Yes - No TIMESTAMP support
-    * - Oracle Database Native Network Encryption (NNE) (see :ref:`nne`)
+    * - Oracle Database Native Network Encryption (see :ref:`nne`)
       - No
       - Yes
       - Yes

doc/src/user_guide/appendix_b.rst

@@ -192,10 +192,19 @@ more information.
 Native Network Encryption and Checksumming
 ------------------------------------------
 
-The python-oracledb Thin mode does not support connections using Oracle Native
-Network Encryption (NNE) and checksumming.  You can enable TLS instead of using
-NNE. If NNE or checksumming are required, then use python-oracledb in the Thick
-mode.
+The python-oracledb Thin mode does not support connections using Oracle
+Database native network encryption or checksumming. You can enable
+TLS instead of using native network encryption. If native network encryption
+or checksumming are required, then use python-oracledb in the Thick mode.
+See :ref:`enablingthick`.
+
+For example, if you use python-oracledb Thin mode and try to connect to the
+Oracle Cloud Infrastructure (OCI) Oracle Base Database where by default native
+network encryption is set to REQUIRED in the ``sqlnet.ora`` file of the OCI
+Oracle Base Database server, the connection will fail with the error::
+
+  DPY-6000: cannot connect to database. Listener refused connection.
+  (Similar to ORA-12660)
 
 Connection Pooling Differences between Thin and Thick Modes
 ===========================================================