开启了waf防火墙后刷新次数多了就出现503

centos 小皮面板里，开启了waf防火墙后刷新次数多了就出现503， 比如连接按个三五次就出提示了。

关了防火墙就没事。 试着只把 cc防护关了，刷新也是一样。不知道是哪里可以解决？

错误如下：

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.