diff --git a/tinyfilemanager.php b/tinyfilemanager.php
index 6462b56..a7d847e 100644
--- a/tinyfilemanager.php
+++ b/tinyfilemanager.php
@@ -244,8 +244,19 @@ if (isset($_GET['logout'])) {
 }
 
 // Validate connection IP
-if($ip_ruleset != 'OFF'){
-    $clientIp = $_SERVER['REMOTE_ADDR'];
+if ($ip_ruleset != 'OFF') {
+    function getClientIP() {       
+        if (array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER)) {
+            return  $_SERVER["HTTP_X_FORWARDED_FOR"];
+        }else if (array_key_exists('REMOTE_ADDR', $_SERVER)) {
+            return $_SERVER['REMOTE_ADDR'];
+        }else if (array_key_exists('HTTP_CLIENT_IP', $_SERVER)) {
+            return $_SERVER['HTTP_CLIENT_IP'];
+        }
+        return '';
+    }
+    
+    $clientIp = getClientIP();
 
     $proceed = false;