Add 401 error page

source/webui/pages/errors/401.php

@@ -0,0 +1,9 @@
+<?php
+
+$main = StatusBoard_Main::instance();
+$req  = $main->request();
+
+$this->smarty->assign('requested_page', $req->request_string());
+
+
+?>

source/webui/templates/errors/401.tpl

@@ -0,0 +1,5 @@
+<h2>This page is not accessible.</h2>
+<p>
+    The page you requested ({$requested_page|escape:html}) could not be opened.
+    Please ensure you are logged in and have permission to access this page.
+</p>