Ticket #5114: 5114.2.diff

wp-includes/pluggable.php

@@ -435 +435 @@
         $lp  = parse_url($location);
         $wpp = parse_url(get_option('home'));
 
-        $allowed_hosts = (array) apply_filters('allowed_redirect_hosts', array($wpp['host']), $lp['host']);
+        $allowed_hosts = (array) apply_filters('allowed_redirect_hosts', array($wpp['host'], strtolower($wpp['host'])), $lp['host']);
 
         if ( isset($lp['host']) && !in_array($lp['host'], $allowed_hosts) )
                 $location = get_option('siteurl') . '/wp-admin/';