not attack The remote server is also a rented server for me, and the remote server hangs causing this issue, because hetzner.com Recent Massive Routing Upgrade, server are offline. When the router maintenance will cause the server to disconnect from the network, the already existing tcp connection to reconnect or has not been able to get a response may repeat the packet sent. When more than one server sends at the same time, it may be considered to be under attack.