Python socket.error：[Errno 104]由peer重置连接

I have a code where there are 13 clients that have to connect to the server. Then the server does some counting on the data given by the client. After that the roles turns around - the server becomes a client and clients become servers to receive the data. The thing is that when trying to do the first connection, that is when the 13 clients try to connect to the server I keep getting this error: I have a code where there are 13 clients that h