diff --git a/admin/mnet/index.php b/admin/mnet/index.php
index ed4ff7df8a9..360e092f676 100644
--- a/admin/mnet/index.php
+++ b/admin/mnet/index.php
@@ -46,11 +46,23 @@
 
             $formcontinue = new single_button(new moodle_url('index.php', array('confirm' => md5($mnet->public_key))), get_string('yes'));
             $formcancel = new single_button(new moodle_url('index.php', array()), get_string('no'));
+
+            echo $OUTPUT->header();
             echo $OUTPUT->confirm(get_string("deletekeycheck", "mnet"), $formcontinue, $formcancel);
+            echo $OUTPUT->footer();
             exit;
         } else {
             // We're deleting
 
+            // If no/cancel then redirect back to the network setting page.
+            if (!isset($form->confirm)) {
+                redirect(
+                    new moodle_url('/admin/mnet/index.php'),
+                    get_string('keydeletedcancelled', 'mnet'),
+                    null,
+                    \core\output\notification::NOTIFY_SUCCESS
+                );
+            }
 
             if (!isset($SESSION->mnet_confirm_delete_key)) {
                 // fail - you're being attacked?
@@ -63,8 +75,12 @@
 
             if($time < time() - 60) {
                 // fail - you're out of time.
-                throw new \moodle_exception ('deleteoutoftime', 'mnet', 'index.php');
-                exit;
+                redirect(
+                    new moodle_url('/admin/mnet/index.php'),
+                    get_string('deleteoutoftime', 'mnet'),
+                    null,
+                    \core\output\notification::NOTIFY_WARNING
+                );
             }
 
             if ($key != md5(sha1($mnet->keypair['keypair_PEM']))) {
@@ -75,7 +91,6 @@
 
             $mnet->replace_keys();
             redirect('index.php', get_string('keydeleted','mnet'));
-            exit;
         }
     }
     $hosts = $DB->get_records_select('mnet_host', "id <> ? AND deleted = 0", array($CFG->mnet_localhost_id), 'wwwroot ASC');
diff --git a/lang/en/mnet.php b/lang/en/mnet.php
index b69c0a22e4b..ec6791942f1 100644
--- a/lang/en/mnet.php
+++ b/lang/en/mnet.php
@@ -110,6 +110,7 @@ $string['is_in_range'] = 'The IP address <code>{$a}</code> represents a valid tr
 $string['ispublished'] = '{$a} has enabled this service for you.';
 $string['issubscribed'] = '{$a} is subscribing to this service on your host.';
 $string['keydeleted'] = 'Your key has been successfully deleted and replaced.';
+$string['keydeletedcancelled'] = 'The key deletion process has been cancelled.';
 $string['keymismatch'] = 'The public key you are holding for this host is different from the public key it is currently publishing. The currently published key is:';
 $string['last_connect_time'] = 'Last connect time';
 $string['last_connect_time_help'] = 'The time that you last connected to this host.';