diff --git a/cdoseaplay/sync.py b/cdoseaplay/sync.py
index 6795b92..a6aa8ef 100755
--- a/cdoseaplay/sync.py
+++ b/cdoseaplay/sync.py
@@ -45,6 +45,7 @@ class Handler(BaseRequestHandler):
                 response = b'WAITING'
             queue = True
         socket = self.request[1]
+        logger.debug("respond to %s: %s", self.client_address[0], response)
         socket.sendto(response, self.client_address)
         if queue:
             self.server.player.queue.put('')
@@ -140,8 +141,6 @@ def main():
 
     peer = (args.peer, args.peer_port)
 
-    time.sleep(10)
-
     DEBUG = args.debug
     if DEBUG:
         log_format = '%(asctime)s:%(levelname)s:%(name)s:%(message)s'
@@ -150,8 +149,9 @@ def main():
     os.chdir(base)
 
     player = get_player(fullscreen=not args.window)
-
-    server = ThreadingUDPServer(('0.0.0.0', args.port), Handler)
+    
+    listen = '::' if ':' in args.peer else ''0.0.0.0''
+    server = ThreadingUDPServer((listen, args.port), Handler)
     server.allow_reuse_address = True
     server.player = Player(peer, player, args.playlist, args.prefix)
     player.register_key_binding('q', server.q_binding)