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I have created a simple multi threaded tcp server using python's threding module. This server creates a new thread each time a new client is connected. #!/usr/bin/env python import socket, threading class ClientThread(threading.Thread): def __init__(self,ip,port): threading.Thread.__init__(self) self.ip = ip self.port = port print "[+] New thread started for "+ip+":"+str(port) def run(self): print "Connection from : "+ip+":"+str(port) clientsock.send("\nWelcome to the server\n\n") data = "dummydata" while len(data): data = clientsock.recv(2048) print "Client sent : "+data clientsock.send("You sent me : "+data) print "Client disconnected..." host = "0.0.0.0" port = 9999 tcpsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) tcpsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) tcpsock.bind((host,port)) threads = [] while True: tcpsock.listen(4) print "\nListening for incoming connections..." (clientsock, (ip, port)) = tcpsock.accept() newthread = ClientThread(ip, port) newthread.start() threads.append(newthread) for t in threads: t.join() Then I opened two new terminals and connected to the server using netcat. Then, when I type and send my first data to the server using the first terminal I connected, reply from the server comes to the other terminal and first connection got disconnected. I guessed the reason but I am doubtful whether this happens because clientsock variable is overwritten so that it refers to the second connection's socket. Am I correct and then how to avoid that? Is there a way other than using an array with limited number of socket variables and using each variable for each connection?

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