I'm trying to connect myself with 2 pythons little programs while using socket.
1st program:
#server.py
import socket
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = '127.0.0.1' #L'IP du Serveur
port = 1234 #data transfering port
server.bind((host,port)) #bind server
server.listen(5)
client, addr = server.accept()
print("Got Connection from",addr)
client.send("Hello World :)".encode('UTF-8')) #send data to client
msg = client.recv(1024)
print(msg.decode('UTF-8'))
input()
2nd program:
#client.py
import socket
server = socket.socket()
host = '127.0.0.1' #L'IP du Serveur
port = 1234
server.connect((host,port))
msg =server.recv(1024)
print(msg.decode('UTF-8'))
server.send('Client Online ...'.encode('UTF-8'))
input()
I first run server.py, no problems. Than, I run client.py but when I run it I have:
"
Traceback (most recent call last):
File "/Users/user/Documents/client.py", line 8, in <module>
server.connect((host,port))
ConnectionRefusedError: [Errno 61] Connection refused
>>>
"
I tried multiple things like desactivate my wall fire, put my 192.168.1.x IP but still have the same message error. I also send that to one of my friends that is on a PC (I'm on a MAC) and he has no problems. So I guess that the problem is because of the fact that I have a mac. Someone have an answer or an explanation ?
I was coding with IDLE. It was the problem. I guess that IDLE has a protection that doesn't allow people to do sockets. So I just went to Terminal and it finally works.
Related
I am a beginner in socket communication and I wanted to test this code.
I wrote the same code but changed the host in the server to s.gethostname() when both the client and server were on my laptop and worked normally.
server: Laptop
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ''
port = 62402
s.bind((host,port))
s.listen(5)
while True:
clientsocket, address = s.accept()
print(f"connection from {address} has been established!")
clientsocket.send(bytes("Welcome to the server!","utf-8"))
client: raspberry pi
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()
port = 62402
s.connect((host,port))
msg = s.recv(1024)
print(msg.decode('utf-8')
Error
Traceback(most recent call last):
File "/home/pi/Desktop/testting/client.py", line 6, in <module>
s.connect((host,port))
ConnectionRefusedError: [Error 111] Connection refused
Connection refused tells me that [the target] is not accepting the connection.
I don’t think ´socket.gethostname()´ can possibly return the laptop’s hostname in its current form.
´print()´ what it returns - I’d bet it’s the local machine’s hostname (the one creating the connection).
Once you know where you’re connecting to, Things that could go wrong:
Is your target listening for a connection on port 62402?
Will its firewall allow such traffic in?
I'm trying to get two computers (my PC and my laptop) to communicate over the Local Network using the Socket module in python.
This is the Server side code running on my PC (connected via LAN):
import socket
HOST = '192.168.1.3' #local PC IP
print(HOST)
PORT = 8080 # Port to listen on (non-privileged ports are > 1023)
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((HOST, PORT))
s.listen()
conn, addr = s.accept()
with conn:
print('Connected by', addr)
while True:
data = conn.recv(1024)
print(data)
if not data:
break
conn.sendall(data)
And this is the Client side code, running on my Laptop (connected over WiFi):
import socket
TCP_IP = '192.168.1.3'
TCP_PORT = 8080
BUFFER_SIZE = 1024
MESSAGE = b"Hello, World!"
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
s.send(MESSAGE)
data = s.recv(BUFFER_SIZE)
s.close()
print("received data:", data)
The thing is: when I execute both codes, the Server side stays idle waiting for a connection and the Client side, after a while stops and returns the following timeout error:
Traceback (most recent call last):
File "C:\Users\...\client.py", line 13, in <module>
s.connect((TCP_IP, TCP_PORT))
TimeoutError: [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
I can't understand why it won't connect from another device in the same network while it works perfectly if I execute the Client code on the same machine as the Server, even if when I run netstat -an in the CMD I can see the computer listening on that port:
TCP 192.168.1.3:8080 0.0.0.0:0 LISTENING
I tough it had something to do with the port forwarding so I tried playing around with it but I'm having troubles with that too (the ports seem to remain closed).
I really don't know what to do next, if you have some advice or know something else I could try please reply.
It actually was a firewall problem, I just needed to disable the windows defender firewall for the local network and now everything is working fine
In Windows 10, I had to open the port I was using for the socket, and it worked for me.
Here is a link to the instructions.
You're listening and connecting to the same IP - you need to listen to the client's IP(or just any IP with the correct port number) on the server and connect to the server's IP on the client.
For example, if the client's IP is 1.2.3.4 and the server's is 1.2.3.5, then
# server side
s.bind(('1.2.3.4', 8080)) # CLIENT_IP = '1.2.3.4'; PORT = 8080
# can also be s.bind(('0.0.0.0', 8080)) if you want multiple clients to connect.
# client side
s.connect(('1.2.3.5', 8080)) # SERVER_IP = '1.2.3.5'; PORT = 8080
Below is my server.py file which runs on cloud based ubuntu system.
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostbyname(socket.gethostname())
port = 5555
s.bind((host, port))
s.listen(1)
print("Server started host={} port={}".format(host, port))
while True:
print('>>>>>>>>>> inside the while')
c, addr = s.accept()
print("Got connection from", addr)
c.send(bytes("Thank you", "utf-8"))
Now the below is my local system client.py file :
import socket
s = socket.socket()
s.connect(('my_cloud_server_ip/ssh',5555))
s.recv(1024)
Error which I am getting this:
Traceback (most recent call last):
File "", line 1, in
TimeoutError: [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
So is there anything wrong with the code or something else?
Thanks in advance.
Try binding to all networks by setting host='0.0.0.0'.
In general I suggest you follow this tutorial Socket Programming in Python (Guide) to use with for starting connections and such.
I would like to make a BT communication between a laptop with a dongle BT and a Raspberry. They are both connected on a PAN network so they have both one IP address.
For the communication, I use a TCP socket. On the server part, I can create my socket until the accept method. Then I go on my RPi 3 and I run my python script:
import socket
hote = "192.168.50.1"
port = 1000
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket.connect((hote, port))
print("Connection on {}".format(port))
socket.close()
But I always have this output after few minutes:
Traceback (most recent call last):
File "socketClient.py", line 7, in <module>
socket.connect((hote, port))
TimeoutError: [Errno 110] Connection timed out
I don't know why... Do you have an idea ? I've tried the command telnet addr_ip port on my laptop and i success the connection with the server.
It was a firewall problem because he stopped the entrance connection.I realized there when I reversed the roles. I put the server code on RPI and client code on my laptop and it worked.
First of all, did you bind the socket? Second, are you listening on that IP and port?
The normal approach creating socket connections is:
Server side:
Create a socket
Bind the socket to a specyfic interface and port
Let the socket listen.
in a loop, try to accept connections to the socket
handle the connection
Client side:
Create a client_socket
Try to connect to the server socket.
Some information about network-programming in python:
here and here
Ive seen similar questions but they I couldn't fix this error. Me and my friend are making a chat program but we keep getting the error
ConnectionRefusedError: [Errno 61] Connection refused
We are on different networks by the way.
Here is my code for the server
import socket
def socket_create():
try:
global host
global port
global s
host = ''
port = 9999
s = socket.socket()
except socket.error as msg:
print("Socket creation error" + str(msg))
#Wait for client, Connect socket and port
def socket_bind():
try:
global host
global port
global s
print("Binding socket to port: " + str(port))
s.bind((host, port))
s.listen(5)
except socket.error as msg:
print("Socket binding error" + str(msg) + "\n" + "Retrying...")
socket_bind
#Accept connections (Establishes connection with client) socket has to be listining
def socket_accept():
conn, address = s.accept()
print("Connection is established |" + " IP:" + str(address[0]) + "| port:" + str(address[1]))
chat_send(conn)
def chat_send(conn):
while True:
chat =input()
if len(str.encode(chat)) > 0:
conn.send(str.encode(chat))
client_response = str(conn.recv(1024), "utf-8")
print(client_response)
def main():
socket_create()
socket_bind()
socket_accept()
main()
And my client code
import socket
#connects to server
s = socket.socket()
host = '127.0.0.1'
port = 9999
s.connect((host, port))
#gets chat
while True:
data = s.recv(1024)
print (data[:].decode("utf-8"))
chat = input()
s.send(str.encode(chat))
This may not answer your original question, but I encountered this error and it was simply that I had not starting the server process first to listen to localhost (127.0.0.1) on the port I chose to test on. In order for the client to connect to localhost, a server must be listening on localhost.
'127.0.0.1' means local computer - so client connents with server on the same computer. Client have to use IP from server - like 192.168.0.1.
Check on server:
on Windows (in cmd.exe)
ipconfig
on Linux (in console)
ifconfig
But if you are in different networks then it may not work. ipconfig/ifconfig returns local IP (like 192.168.0.1) which is visible only in local network. Then you may need external IP and setting (redirections) on your and provider routers. External IP can be IP of your router or provider router. You can see your external IP when you visit pages like this http://httpbin.org/ip . But it can still need some work nad it be bigger problem.
You need simply to start server at first, and then run the client_code.
In VS Code i've opened 2 terminals. One for the server_code to be running While True, and the other one for the client_code
So this may not fix your question specifically but it fixed mine and it can help someone else I work with vscode and I use some extension that runs my code so when you want to run your server run it on your CMD or Terminal and run your client in vscode it helped me (maybe importat I work on mac so maybe spesific OS problem)
If you are connecting to a host:port that is open but there is no service bound to it you may see this IIRC. Eg with ssh you sometimes see this while attempting to connect to a server that is booting but sshd is not running.
This Code Not Valid For Chatting, you have to use unblocking sockets and select module or other async modules