I have Paypal standard setup as our default payment for web. When I try to go to the URL that paypal has noted as the Notification URL, I get a 404. Is this the page that is returning it, or is there some deeper issue occuring? I see the file and everything looks right, I just can't get to the notification url. IPN History is complaining it can't reach the notification URL and logs a 404 error as the reason. Any ideas?