diff --git a/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_api.py b/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_api.py
index 674629d1315..a2f4c3d7082 100644
--- a/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_api.py
+++ b/cinder/tests/unit/volume/drivers/netapp/dataontap/client/test_api.py
@@ -508,9 +508,10 @@ class SSHUtilTests(test.TestCase):
                           self.sshutil.execute_command, ssh, 'ls')
         wait_on_stdout.assert_not_called()
 
-    @ddt.data('Password:',
-              'Password: ',
-              'Password: \n\n')
+    @ddt.data(b'Password:',
+              b'Password: ',
+              b'Password: \n\n',
+              b'Fake response \r\n Password: \n\n')
     def test_execute_command_with_prompt(self, response):
         ssh = mock.Mock(paramiko.SSHClient)
         stdin, stdout, stderr = self._mock_ssh_channel_files(paramiko.Channel)
@@ -533,7 +534,7 @@ class SSHUtilTests(test.TestCase):
         ssh = mock.Mock(paramiko.SSHClient)
         stdin, stdout, stderr = self._mock_ssh_channel_files(paramiko.Channel)
         stdout_read = self.mock_object(stdout.channel, 'recv',
-                                       return_value='bad response')
+                                       return_value=b'bad response')
         self.mock_object(ssh, 'exec_command',
                          return_value=(stdin, stdout, stderr))
 
diff --git a/cinder/volume/drivers/netapp/dataontap/client/api.py b/cinder/volume/drivers/netapp/dataontap/client/api.py
index ada92e7f107..99e32875fdc 100644
--- a/cinder/volume/drivers/netapp/dataontap/client/api.py
+++ b/cinder/volume/drivers/netapp/dataontap/client/api.py
@@ -601,7 +601,7 @@ class SSHUtil(object):
         stdin, stdout, stderr = client.exec_command(command)
         self._wait_on_stdout(stdout, timeout)
         response = stdout.channel.recv(999)
-        if response.strip() != expected_prompt_text:
+        if expected_prompt_text not in response.strip().decode():
             msg = _("Unexpected output. Expected [%(expected)s] but "
                     "received [%(output)s]") % {
                 'expected': expected_prompt_text,
diff --git a/releasenotes/notes/bug-1914639-fix-chap-auth-issue-in-netapp-driver-e92eaa431d6fcbac.yaml b/releasenotes/notes/bug-1914639-fix-chap-auth-issue-in-netapp-driver-e92eaa431d6fcbac.yaml
new file mode 100644
index 00000000000..6aed5cdc749
--- /dev/null
+++ b/releasenotes/notes/bug-1914639-fix-chap-auth-issue-in-netapp-driver-e92eaa431d6fcbac.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Fixed a CHAP authentication issue while trying to attach an iSCSI volume
+    using the NetApp ONTAP driver. Please refer to the
+    `Launchpad bug #1914639 <https://bugs.launchpad.net/cinder/+bug/1914639>`_
+    for more details.