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POPython socket on Windows 7 is not accessible from another machine
 

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  1. POPython socket on Windows 7 is not accessible from another machine
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    <p>I'm trying to create a Python program that will listen on a socket. I'm using Windows 7 with Python 2.7. Whatever I do, the socket seems to be accessible from the local machine but not from elsewhere on the network.</p> <p>I've got the following code:</p> <pre><code>from werkzeug.wrappers import Request, Response @Request.application def application(request): return Response('Hello World!') if __name__ == '__main__': from werkzeug.serving import run_simple # Using empty string or the machine's real IP address here # gives the same problem run_simple('0.0.0.0', 4000, application) </code></pre> <p>If I connect from the local machine I see the response fine. If I execute</p> <pre><code>$ curl 'http://192.168.1.1:4000/' </code></pre> <p>from another (linux) box on the network, the curl hangs for a long time before timing out. Wireshark shows that I receive a SYN packet to port 4000 but don't see it ACKed.</p> <p>I've tried making sure packets to this port are allowed through the firewall (the fact that I see the SYNs in Wireshark suggests this is not the problem). I've tried setting Python to run as administrator (and I've checked that <code>ctypes.windll.shell32.IsUserAnAdmin()</code> returns true). This isn't just Werkzeug, I've tried with SocketServer from the Python standard library as well.</p> <p>Running Windows Apache on the same port works fine from across the network, which suggests there's no problem with the network or firewall or with my <code>curl</code> request.</p> <p><code>netstat -an</code> shows:</p> <pre><code>TCP 0.0.0.0:4000 0.0.0.0:0 LISTENING </code></pre> <p><strong>Edit</strong>: I've tried with the following minimal code. On the server side (Windows 7):</p> <pre><code>import socket s = socket.socket() s.bind(('', 8080)) s.listen(1) remotesock, addr = s.accept() </code></pre> <p>And on the linux client:</p> <pre><code>import socket s = socket.socket() s.connect('192.168.1.1', 8080) </code></pre> <p>This hangs until timeout, as with the curl.</p>
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    1. USTim Martin
    1. USTim Martin
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    1. CODo a test with your firewall completely unactivated.
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      1. POPython socket on Windows 7 is not accessible from another machine
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    2. COUnfortunately disabling the firewall completely is not possible due to the group policy applied by my company's IT department. I could probably get this changed eventually, but given that I have a rule allowing access on all ports, and given that Apache is visible when run on the same port, I can't see how the firewall can be the problem.
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      1. POPython socket on Windows 7 is not accessible from another machine
      1. USTim Martin
    3. COSimple debug step would be to open python and create a socket that's listening for a connection from anywhere. Then goto your remote machine, create a socket, and connect it to the listener. This is about as barebones as you can get. If you can't connect your remote machine, you have an external issue. 'import socket; s=socket.socket(); s.listen(1); remotesock, addr = s.accept()' Then on remote: 'import socket; s=socket.socket(); s.connect(serveraddr, serverport)'
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      1. USgregb212
 

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