@Hao It seems like the 172.17.0.1 is closing the connection, is this your laptop’s IP address?
2021-07-22 01:12:23,797 [UserServer-1] INFO c.d.sabot.rpc.user.UserRPCServer - [USER]: Channel closed /172.17.0.3:31010 <--> /172.17.0.1:48246 (user client)