Index: typo3/sysext/cms/tslib/class.tslib_fe.php
===================================================================
--- typo3/sysext/cms/tslib/class.tslib_fe.php	(revision 8192)
+++ typo3/sysext/cms/tslib/class.tslib_fe.php	(working copy)
@@ -973,13 +973,19 @@
 		$GLOBALS['TT']->pull();
 
 		if ($this->pageNotFound && $this->TYPO3_CONF_VARS['FE']['pageNotFound_handling'])	{
+			$header = t3lib_utility_Http::HTTP_STATUS_404;
 			$pNotFoundMsg = array(
 				1 => 'ID was not an accessible page',
 				2 => 'Subsection was found and not accessible',
 				3 => 'ID was outside the domain',
 				4 => 'The requested page alias does not exist'
 			);
-			$this->pageNotFoundAndExit($pNotFoundMsg[$this->pageNotFound]);
+
+			if ($this->pageNotFound === 1 || $this->pageNotFound === 2) {
+				$header = t3lib_utility_Http::HTTP_STATUS_401;
+			}
+
+			$this->pageNotFoundAndExit($pNotFoundMsg[$this->pageNotFound], $header);
 		}
 
 			// set no_cache if set