Error getting response; null

Thanks for such a fast reply! I've just checked the recent log entries and apparently there's a 500 error - it's not finding the rcp.php. I've checked the server permissions (putting it as the correct owner and making it have 644 permisions) but still can't get it to work. In another issue I saw you mention navigating to the rpc.php file itself inside the browser - if I try and go that it gives me an Access Denied error page.