Hi, I noticed that when a page requires the use of the POST method the server replies with a 500 error when using an invalid method (GET). This is handled by the _assertPostOnly() method in library/XenForo/Controller.php The error visible on the page is "This action is available via POST only. Please press the back button and try again." As the error is related to the method used to access the page it should return a "405 Method Not Allowed" error instead of a 500. You can reproduce by going to http://yoururl/login/login The patch is attached to this message.