diff --git a/src/judas_server/backend/backend_server.py b/src/judas_server/backend/backend_server.py
index 3511e18..a1ddd59 100644
--- a/src/judas_server/backend/backend_server.py
+++ b/src/judas_server/backend/backend_server.py
@@ -109,6 +109,8 @@ class BackendServer:
         client = Client(id_=mac_id, addr=addr, socket=conn)
         self.clients[mac_id] = client
 
+        self._send_ack(client)
+
         events = selectors.EVENT_READ | selectors.EVENT_WRITE
         self.selector.register(conn, events, data=client)