I am trying to connect a client machine to a server mashine in different network using PYRO4 and Python 2.7
My server code is:
import Pyro4
class Thing(object):
def method(self, arg):
return arg*2
daemon=Pyro4.Daemon(port=9999,nathost="78.149.X.X", natport=5555)
uri=daemon.register(Thing(),"gameServer") # register Thing() as a Pyro object
print "Ready. Object uri =", uri
daemon.requestLoop()
and the client code is:
import Pyro4
server = Pyro4.Proxy("PYRO:gameServer#78.149.X.X:5555")
print server.method(6)
However, when I ran the server, I got this error:
CommunicationError: cannot connect: [Errno 10061] No connection could be made because the target machine actively refused it
I am searching since 8 hours to fix this issue but it seems it will not be fixed forever. Please if anybody know the solution please help me.
NOTE:
1. I am rannig the server behind a router, so I forworded the port 5555 to my private IP address. Also, I tested the port by an online service and its opend correctly.
I closed the firewall and the antivirus software.
Have you tried all the suggestions mentioned in the manual?
Your daemon simply is not accessible on the address that you think it is. Perhaps you need to add an appropriate binding host to the daemon constructor call, to bind it on the network interface that is accessible from the outside.
Also try to eliminate possible causes one by one and see which one is the culprit. For instance, have you tried to run it without the router in between?
Related
I'll try be concise, but please let me know if I can provide any more helpful pieces of information.
I have client and server Python programs, and they work fine when ran on the same machine, and when the client connects to my machine's local IP (not 127.0.0.1, but the IP assigned to my machine). I have not been able to get this to work with my public IP.
I get a [Errno 61] Connection refused error when I try to get the client to connect to my router's public IP address. My server binds to all interfaces using bind(("0.0.0.0", 50000)), and I already set up port forwarding for my router. I verified that the program is listening on that port by running netstat -an | grep LISTEN and finding the following line:
tcp4 0 0 *.50000 *.* LISTEN
I can also seemingly reach the port through an online port checking tool, which shows that the port is open when I am running my program, and closed when I close that program. My program also registers the connection from this tool.
The fact that my program accepts the connection from the port checking tool gives me the impression that my client code is missing something, but I can't find any answers. It might be worth noting that I am still running my server and client code on the same machine, but I'm not sure why that would derail things. Here's the code I use to connect on the client side:
tcp_client = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
tcp_client.connect(('my_public_ip', 50000))
Are there any diagnostic steps that I can follow to narrow down my issue?
Before you spend any more time on this, try connecting to your public ip from a computer outside your home network. Spend a couple of dollars on an AWS instance for an hour if you have to, or try connecting from a friend's machine, whatever. It will probably work just fine.
I suspect the problem is simply that you cannot, from inside your home network, connect to your router's public ip address. I tried the same thing with my local network and ran into the same behavior.
If you really need to your public ip during development, you can just assign that as an alias to one of your local interfaces (ip addr add 1.2.3.4/32 dev eth0)...but it's probably easier just to use your an address on your local network, or just arrange for regular access to a remote system for testing.
I am very new to socket programming. I am trying to connect to a power supply over ethernet. My Mac (OS X) is connected to an ethernet switch and the power supply is also connected to the switch. I have some code written in python to send/receive commands/messages to/from the power supply.
The switch interface allows me to assign a static IP to the supply. It is this same IP that I use as the target IP in the following code:
def __init__( self, IP_TARGET ):
IP = IP_TARGET
PORT = 8080
self.supply = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )
self.supply.connect( (IP, PORT) )
This code runs without any issues. My next goal is communicate with the device using the following code:
def getDeviceInfo( self ):
self.supply.send('some command ')
self.supply.recv(10)
Using some print statements I have narrowed the issue down to the recv() command. The send() throws no errors. I get the following error
...in getDeviceInfo
self.supply.recv(10) socket.error: [Errno 61] Connection refused
I am able to ping the device using the IP that I assigned it using the ethernet switch. I have firewall off. I have searched the www for clues as to how I might resolve this error, but to no avail. Any thoughts?
It looks like there is nothing running on the host and port you specified (you can check it with nmap, for example).
In the case it does, is it expecting to receive anything and responding to it?
EDIT: your code is not working because in the remote host and the port you specified (8080), there must be some some code running, listening for messages and responding to them. If there is nothing running on that port, it obviously returns you the "Connection refused" error.
In other words, you created the client, but not the server :P
The port I chose was random (I thought anything above 4096 would be
okay).
See the Digi Connect® Family Command Reference on how to Access the Command Line.
The Command-Line Interface for the Digi device uses the telnet port, which is TCP port 23.
(The port number restrictions you were probably thinking of apply only if you do the server.)
An error is repeatedly being thrown at this line:
client = MongoClient('ec2-12-345-67-89.us-east-2.compute.amazonaws.com', 27017,
ssl=True, ssl_keyfile='C:\\mongo.pem')
(Paths and instance name changed for obvious reasons)
The port (27017) for mongo is allowed inbound connections from my AWS security group. First, I allowed only my IP, now I'm allowing all via that port. I have tried preceding the connection string with "mongodb://" and removing the SSL arguments (I'm fairly certain I don't need it).
The error IntelliJ keeps throwing me is:
pymongo.errors.ConnectionFailure: [WinError 10061] No connection could be made because the target machine actively refused it
It works if I transport the script to the AWS instance and replace the DNS with 'localhost' and remove SSL parameters, but I need this to work remotely.
Three ideas:
Ensure "bind_ip" is set to "0.0.0.0" in your mongod.conf and restart mongod, as #ajduke suggests.
Make sure mongod is running.
Try to connect to the mongod from your client machine using the "mongo" shell to see if it gives you a more informative error.
I would try connect to a counterstrike server hosted on my ip through python socketing ...
import socket
s = socket.socket()
s.connect(("localhost", 27015))
But I would get an error
error: [Errno 10061] No connection could be made because the target machine actively refused it
And I'm sure the server is up, so I'm not sure why it wouldn't connect, I could connect to it in game.
To debug such things you can use Wireshark to observe your Python script while it is trying to connect and compare it to a real client. You may have to listen on the "localhost" interface instead of your physical network interface to see the connection. Your server needs to do the same, so ask your OS to give you a list of bound sockets, including the IPs they are bound to (on Linux netstat -nlp) to check. Maybe the server needs to be configured to allow non-public IPs. Finally, make sure you got the protocol right, TCP (SOCK_STREAM) vs UDP (SOCK_DGRAM).
For a class project I'm trying to do some socket programming Python but running into a very basic issue. I can't create a TCP connection from my laptop to a lab machine. (Which I'm hoping to use as the "server") Without even getting into the scripts I have written, I've been simply trying interpreter line commands with no success. On the lab machine (kh4250-39.cselabs.umn.edu) I type the following into Python:
from socket import *
sock = socket()
sock.bind(('', 8353))
sock.listen(5)
sock.accept()
And then on my laptop I type:
from socket import *
sock = socket()
sock.connect(('kh4250-39.cselabs.umn.edu', 8353))
At which point both machines block and don't do anything until the client times out or I send a SIGINT. This code is pretty much exactly copied from examples I've found online and from Mark Lutz's book Programming Python (using '' for the server host name apparently uses the OS default and is fairly common). If I run both ends in my computer and use 'localhost' for the hostname it works fine, so I suspect it's some problem with the hostnames I'm using on one or both ends. I'm really not sure what could be going wrong on such a simple example. Does anyone have an idea?
A good way to confirm whether it's a firewall issue or not is to perform a telnet from the command-line to the destination host in question:
% telnet kh4250-39.cselabs.umn.edu 8353
Trying 128.101.38.44...
And then sometime later:
telnet: connect to address 128.101.38.44: Connection timed out
If it just hangs there at Trying and then eventually times out, chances are the connection to the remote host on that specific port is being blocked by a firewall. It could either be at the network layer (e.g. a real firewall or a router access-list) or at the host, such as iptables or other host-based filtering mechanisms.
Access to this lab host might only be available from within the lab or the campus network. Talk with your professor or a network administrator or someone "in the know" on the network to find out for sure.
Try to bind the server to 'kh4250-39.cselabs.umn.edu' instead of '':
sock.bind(('kh4250-39.cselabs.umn.edu', 8353))
If this does not work: Another reason could be a firewall blocking the port 8353....