Index: typo3/init.php
===================================================================
--- typo3/init.php	(revision 7429)
+++ typo3/init.php	(working copy)
@@ -265,6 +265,7 @@
 if ($TYPO3_CONF_VARS['BE']['adminOnly'] < 0)	{
 	header('Status: 404 Not Found');	// Send Not Found header - if the webserver can make use of it...
 	header('Location: http://');	// Just point us away from here...
+	t3lib_BEfunc::typo3printError('Backend locked', 'Backend and Install Tool are locked for maintenance. [BE][adminOnly] is set to "' . intval($TYPO3_CONF_VARS['BE']['adminOnly']) . '".');
 	exit;	// ... and exit good!
 }
 if (!(defined('TYPO3_cliMode') && TYPO3_cliMode) && @is_file(PATH_typo3conf.'LOCK_BACKEND'))	{