diff --git a/dist/admin/html.open/lib/LSWebAdmin/Auth/CAuthorizer.php b/dist/admin/html.open/lib/LSWebAdmin/Auth/CAuthorizer.php
index 30789489..be3cd833 100644
--- a/dist/admin/html.open/lib/LSWebAdmin/Auth/CAuthorizer.php
+++ b/dist/admin/html.open/lib/LSWebAdmin/Auth/CAuthorizer.php
@@ -127,6 +127,14 @@ private function getRequestHost()
 
     private function getRequestPort()
     {
+        $host = UIBase::GrabInput('server', 'HTTP_HOST');
+        if ($host !== '' && ($pos = strpos($host, ':')) !== false) {
+            $port = substr($host, $pos + 1);
+            if (ctype_digit($port) && (int) $port > 0 && (int) $port <= 65535) {
+                return (int) $port;
+            }
+        }
+
         $port = UIBase::GrabInput('server', 'SERVER_PORT', 'int');
         return ($port > 0) ? $port : null;
     }