We are using Varnish as frontend server and Apache for the backend. This means $_SERVER['REMOTE_ADDR'] will always return 127.0.0.1 (i.e. the localhost address). The real client ip address however is available in the "X-Forwarded-For" header. Now, browsing through the XenForo code, it seems there is some sort of support for X-Forwarded-For in Zend_Controller_Request_Http::getClientIp($checkProxy); the problem is this method is almost always called with the $checkProxy parameter false (see screenshot below). A simple "echo $request->getClientIp(false)" on the homepage indeed returns 127.0.0.1 so this won't work. I would like to propose a solution for this issue. We are using Symfony 2 for our main website and this framework has support for trusting proxies. Have a look: 1) Configure the ip address of the proxy server: http://symfony.com/doc/current/components/http_foundation/trusting_proxies.html http://symfony.com/doc/current/refe...work.html#reference-framework-trusted-proxies 2) Check if the "X-Forwarded-For" header is valid in getClientIp(): https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/Request.php#L782 https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/Request.php#L813 It would be extremely helpful if XenForo could provide support for this.