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POSocket 'No route to host' error
 

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  1. POSocket 'No route to host' error
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    <p>I have a connection which is behind a restrictive firewall which only allows HTTP(S) access through a proxy (10.10.1.100:9401). The IP address I get is dynamic and the subnet mask is 255.255.255.255 (I know, weird!).</p> <p>I tried to write a simple Python socket program to connect to the proxy in order to send some HTTP requests:</p> <pre><code>import socket s = socket.socket( socket.AF_INET, socket.SOCK_STREAM ) s.connect(( "10.10.1.100", 9401 )) s.send("GET /index.html HTTP/1.1\r\nHost: aorotos.com\r\n\r\n") d = s.recv(1024) print d s.close() </code></pre> <p>I get an exception (113, "No route to host") during the connect. Now here is the weird part&mdash;I can browse the web using these same proxy settings, and if check the currently connected sockets via <code>netstat -tna</code> I see an ACTIVE connection to 10.10.1.100:9401. </p> <p>I tried a simple command like <code>export http_proxy='10.10.1.100:9401' &amp;&amp; wget aorotos.com/index.html</code> and even that works! If I enable the debug option (<code>-d</code>) in wget, I can even get the socket's file descriptor. </p> <p>I went through the wget source code, and from what I can see it too uses a normal connect statement and does not set any special socket options (I'll go through it more throughly later). I've tried the same code in C, and it too fails. </p> <p>The routing table provided via <code>route</code> is</p> <pre><code>Destination Gateway Genmask Flags Metric Ref Use Iface default * 0.0.0.0 U 0 0 0 gprs0 </code></pre> <p>Does anyone have any idea what might be wrong?</p> <p>EDIT: Currently my IP is 10.16.82.250. And that is all that is there in the <code>route</code> output. If you're interested my external IP is 203.8.8.2. </p> <p><code>ifconfig gprs0</code> -</p> <pre><code>gprs0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:10.17.221.94 P-t-P:10.17.221.94 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MTU:1400 Metric:1 RX packets:1832 errors:0 dropped:0 overruns:0 frame:0 TX packets:1844 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:10 RX bytes:1878364 (1.7 MiB) TX bytes:224746 (219.4 KiB) </code></pre> <p>EDIT 2 : I landed up installing tcpdump and going through it's manual, and finally installing wireshark ( I'm on my N900 ) only to realize, from the packet dump, that I've been using the port 4901 instead of 9401 in both in C program and the python script! Doh! I blame the small screen and, well, myself. </p> <p>Is there any way to close this question with a "I'm an idiot" or something? :P Sorry for taking up your time! ( I've spent over a week on this. I can't believe I went through most of <code>wget</code>'s source code! )</p>
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    1. USVishesh Handa
    1. USVishesh Handa
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      1. VTUpMod
    1. COThe route output is a little fishy, is that the only output or is there more? As well -- can you give an example valid IP address for gprs0's interface?
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      1. USsynthesizerpatel
    2. COWhat does `ifconfig` say?
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      1. USbstpierre
    3. COGiven that you found the problem using wireshark, and this is what doron's answer suggested, it seems fair to accept that answer.
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      1. USbstpierre
 

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