diff U3 a/core/lib/Drupal/Core/FileTransfer/Form/FileTransferAuthorizeForm.php b/core/lib/Drupal/Core/FileTransfer/Form/FileTransferAuthorizeForm.php
--- a/core/lib/Drupal/Core/FileTransfer/Form/FileTransferAuthorizeForm.php	Wed Feb 03 10:47:36 2016
+++ b/core/lib/Drupal/Core/FileTransfer/Form/FileTransferAuthorizeForm.php	Sat Feb 20 18:19:46 2016
@@ -12,6 +12,7 @@
 use Drupal\Core\Render\Element;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\RedirectResponse;
 
 /**
  * Provides the file transfer authorization form.
@@ -70,7 +71,7 @@
 
     // Decide on a default backend.
     if ($authorize_filetransfer_default = $form_state->getValue(array('connection_settings', 'authorize_filetransfer_default')));
-    elseif ($authorize_filetransfer_default = $this->config('system.authorize')->get('filetransfer_default'));
+    elseif ($authorize_filetransfer_default = $this->configFactory()->getEditable('system.authorize')->get('filetransfer_default'));
     else {
       $authorize_filetransfer_default = key($available_backends);
     }
@@ -220,15 +221,18 @@
             }
           }
           // Set this one as the default authorize method.
-          $this->config('system.authorize')->set('filetransfer_default', $filetransfer_backend);
+          $this->configFactory()->getEditable('system.authorize')->set('filetransfer_default', $filetransfer_backend);
           // Save the connection settings minus the password.
-          $this->config('system.authorize')->set('filetransfer_connection_settings_' . $filetransfer_backend, $connection_settings);
+          $this->configFactory()->getEditable('system.authorize')->set('filetransfer_connection_settings_' . $filetransfer_backend, $connection_settings);
 
           $filetransfer = $this->getFiletransfer($filetransfer_backend, $form_connection_settings[$filetransfer_backend]);
 
           // Now run the operation.
           $response = $this->runOperation($filetransfer);
-          if ($response instanceof Response) {
+
+          if ($response instanceof RedirectResponse) {
+            $response->send();
+          }elseif ($response instanceof Response) {
             $form_state->setResponse($response);
           }
         }
@@ -249,6 +253,7 @@
         break;
     }
   }
+ 
 
   /**
    * Gets a FileTransfer class for a specific transfer method and settings.
@@ -285,7 +290,7 @@
    * @see hook_filetransfer_backends()
    */
   protected function addConnectionSettings($backend) {
-    $auth_connection_config = $this->config('system.authorize')->get('filetransfer_connection_settings_' . $backend);
+    $auth_connection_config = $this->configFactory()->getEditable('system.authorize')->get('filetransfer_connection_settings_' . $backend);
     $defaults = $auth_connection_config ? $auth_connection_config : array();
     $form = array();