diff --git a/nginx/nginx-sample.conf b/nginx/nginx-sample.conf
index c63b755..80c0873 100644
--- a/nginx/nginx-sample.conf
+++ b/nginx/nginx-sample.conf
@@ -157,7 +157,8 @@ http {
             grpc_pass grpc://127.0.0.1:$1;
         }
         location / {
-            proxy_pass http://sub.test.com;
+            root /usr/share/nginx/html;
+            return 503;
         }
     }
 }