import socket

serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serversocket.bind(('', 8089))
serversocket.listen(5) # become a server socket, maximum 5 connections

while True:
    connection, address = serversocket.accept()
    buf = connection.recv(64)
    if len(buf) > 0:
        print (buf)
        break

import socket

print("Client calling .....")

socket_main = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket_main.connect(('192.168.1.171', 8089))

while True:
    message = 'Hello'
    socket_main.send(message.encode())

Traceback (most recent call last):
  File "C:\script\client.py", line 6, in <module>
    socket_main.connect(('192.168.1.171', 8089))
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it

# server code
import socket

serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # allows reuse of the same port if the server script restarts
serversocket.bind(('', 8089))
serversocket.listen(5) # become a server socket, maximum 5 connections

while True:
    connection, address = serversocket.accept()
    try:
        buf = connection.recv(64)
        if buf:
            print (buf)
    finally:
        connection.close()

import socket

print("Client calling .....")

socket_main = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
    socket_main.connect(('', 8089))
except ConnectionRefusedError:
    print('Cannot connect to server')
else:
    while True:
        message = 'Hello'
        try:
            socket_main.send(message.encode())
        except ConnectionResetError:
            break

(Jan-13-2025, 09:12 AM)Gribouillis Wrote: This is probably due to the break statement in your server code. Here is a modified code that works for me

# server code
import socket

serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # allows reuse of the same port if the server script restarts
serversocket.bind(('', 8089))
serversocket.listen(5) # become a server socket, maximum 5 connections

while True:
    connection, address = serversocket.accept()
    try:
        buf = connection.recv(64)
        if buf:
            print (buf)
    finally:
        connection.close()

and the client code (on the same host)

import socket

print("Client calling .....")

socket_main = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
    socket_main.connect(('', 8089))
except ConnectionRefusedError:
    print('Cannot connect to server')
else:
    while True:
        message = 'Hello'
        try:
            socket_main.send(message.encode())
        except ConnectionResetError:
            break

Are you server and client code on different hosts? I would not recommend disabling the firewall...

========================= RESTART: C:\script\client.py =========================
Client calling .....
Traceback (most recent call last):
  File "C:\script\client.py", line 7, in <module>
    socket_main.connect(('', 8089))
OSError: [WinError 10049] The requested address is not valid in its context

(Jan-13-2025, 09:25 AM)absolut Wrote: The requested address is not valid in its context

(Jan-13-2025, 10:05 AM)Gribouillis Wrote:

(Jan-13-2025, 09:25 AM)absolut Wrote: The requested address is not valid in its context

I don't know your exact machine settings and I don't use Windows. Try to fix the host addresses in my code. Instead of '', try to use 'localhost' or '127.0.0.1' or '0.0.0.0' or '192.168.1.171' as you did before.