Client.py doesnt connect to server.py

Question

I have problem with python3 network (socket) programming. The problem is, when i run server.py everything is good. Than i open client.py, it must connect to server.py but it doesnt connect. It stays for 5-15 seconds then it gives error about connection. I give access python to use network. I dont know why its not working.

Server.py codes:

import socket

socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

host = '127.0.0.1'
port = 80

Buffer_Size = 1024

socket.bind((host, port))
socket.listen(1)
connectionNumber = 1
print("\n" + "[SERVER] Port" + str(port) + "opened. Connections are listening..." + "\n")

while True:
    print("\n" + "*"*50)
    print("[SERVER] Waitong connection {}...".format(connectionNumber))
    conn, addr = socket.accept()
    print("[SERVER] Connected to {}".format(addr))
    print("[SERVER] Receiving bytes...")
    while True:
        msgFromClient = socket.recv(Buffer_Size)
        if not msgFromClient:
            print("[SERVER] No message received.")
            break
        
        print("[CLIENT]: {}".format(msgFromClient))
        print("[SERVER] Message received, buffer emptied. " + connectionNumber + "Closing Connection...")
        conn.send(str(msgFromClient) + ". You are the client. Thanks for connecting!")
    conn.close()
    print("[SERVER] Connection closed...")
    connectionNumber += 1

client.py codes:

import getpass

pcName = getpass.getuser()

import socket

clientName = socket.gethostname()
clientIP = socket.gethostbyname(socket.gethostname())

sendingMessageToServer = pcName +"___" + clientName + "___"+ clientIP

import socket

clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

host = '127.0.0.1'
port = 80
Buffer_Size = 1024
clientSocket.connect((host, port)) 

print("Sending message: {}".format(sendingMessageToServer))

clientSocket.send(sendingMessageToServer)

print("Message Sended Succesfully!")

messageFromServer = clientSocket.recv(Buffer_Size)

print("[SERVER] Received message: {}".format(messageFromServer))

print("[CLIENT SERVER] Message received.. Closing connection...")

clientSocket.close()

Answer 1

First of all you should change your port 80 because it is used by http connection. Maybe your system is taking it over. Set for example port 8001. In server.py you get incoming data from created conn object, not socket :

msgFromClient = conn.recv(Buffer_Size)

Also data received or sent through socket should be bytes type, not str therefore you should change all recv and send parameters to bytes, for example:

conn.send(msgFromClient + b". You are the client. Thanks for connecting!")

or in client.py :

clientSocket.send(sendingMessageToServer.encode())