diff --git a/manila/share/drivers/netapp/dataontap/client/api.py b/manila/share/drivers/netapp/dataontap/client/api.py
index 856b9e838a..7c7aeee0a5 100644
--- a/manila/share/drivers/netapp/dataontap/client/api.py
+++ b/manila/share/drivers/netapp/dataontap/client/api.py
@@ -269,7 +269,9 @@ class ZapiClient(BaseClient):
             ssl_cert_path=ssl_cert_path, username=username, password=password,
             port=port, trace=trace, api_trace_pattern=api_trace_pattern)
         self.set_server_type(server_type)
-        self._set_port()
+        if port is None:
+            # Not yet set in parent, use defaults
+            self._set_port()
 
     def _set_port(self):
         """Defines which port will be used to communicate with ONTAP."""
@@ -444,7 +446,9 @@ class RestClient(BaseClient):
             host, transport_type=transport_type, style=style,
             ssl_cert_path=ssl_cert_path, username=username, password=password,
             port=port, trace=trace, api_trace_pattern=api_trace_pattern)
-        self._set_port()
+        if port is None:
+            # Not yet set in parent, use defaults
+            self._set_port()
 
     def _set_port(self):
         if self._protocol == TRANSPORT_TYPE_HTTP:
diff --git a/manila/tests/share/drivers/netapp/dataontap/client/test_api.py b/manila/tests/share/drivers/netapp/dataontap/client/test_api.py
index f2c9c6e911..8da9690511 100644
--- a/manila/tests/share/drivers/netapp/dataontap/client/test_api.py
+++ b/manila/tests/share/drivers/netapp/dataontap/client/test_api.py
@@ -265,6 +265,11 @@ class NetAppApiServerZapiClientTests(test.TestCase):
         expected_log_count = 2 if log else 0
         self.assertEqual(expected_log_count, api.LOG.debug.call_count)
 
+    @ddt.data('1234', 5678)
+    def test_custom_port(self, port):
+        root = api.NaServer('127.0.0.1', port=port).zapi_client
+        self.assertEqual(str(port), root.get_port())
+
 
 @ddt.ddt
 class NetAppApiServerRestClientTests(test.TestCase):
@@ -462,3 +467,8 @@ class NetAppApiServerRestClientTests(test.TestCase):
             url, fake.FAKE_HTTP_QUERY)
 
         self.assertEqual(expected_formated_url, formatted_url)
+
+    @ddt.data('1234', 5678)
+    def test_custom_port(self, port):
+        root = api.NaServer('127.0.0.1', port=port).rest_client
+        self.assertEqual(str(port), root.get_port())
diff --git a/releasenotes/notes/bug-1945365-netapp-fix-port-conf-91552d3f61378c94.yaml b/releasenotes/notes/bug-1945365-netapp-fix-port-conf-91552d3f61378c94.yaml
new file mode 100644
index 0000000000..c624d9f465
--- /dev/null
+++ b/releasenotes/notes/bug-1945365-netapp-fix-port-conf-91552d3f61378c94.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    NetApp cDOT driver Custom port configuration using ``netapp_server_port``
+    was accidentally ignored after a refactor. This option should now be
+    properly read. See `Launchpad bug 1945365 <https://bugs.launchpad.net/manila/+bug/1945365>`_
+    for more details.