Index: wp-content/plugins/akismet/akismet.php
===================================================================
--- wp-content/plugins/akismet/akismet.php      (revision 19874)
+++ wp-content/plugins/akismet/akismet.php      (working copy)
@@ -189,7 +189,7 @@
        $comment['referrer']   = $_SERVER['HTTP_REFERER'];
        $comment['blog']       = get_option('home');

-       $ignore = array( 'HTTP_COOKIE' );
+       $ignore = array( 'HTTP_COOKIE', 'REMOTE_USER', 'AUTH_TYPE',
'PHP_AUTH_USER', 'PHP_AUTH_PW', 'HTTP_AUTHORIZATION' );

        foreach ( $_SERVER as $key => $value )
                if ( !in_array( $key, $ignore ) )