PHP:
if ($_SERVER['HTTP_X_FORWARDED_FOR'] || $_SERVER['HTTP_X_FORWARDED'] || $_SERVER['HTTP_FORWARDED_FOR'] || $_SERVER['HTTP_CLIENT_IP'] || $_SERVER['HTTP_VIA'] || @fsockopen( $_SERVER['REMOTE_ADDR'], 80, $errstr, $errno, 1 ) || @fsockopen( $_SERVER['REMOTE_ADDR'], 443, $errstr, $errno, 1 )){
echo 'Proxy veya VPN Erişimine İzin Verilmemektedir.';
}