Python socket.error：[Errno 113]没有路由到主机，但ping有效

Question

I am trying to connect using TCP. In the client side I have the following code

import socket
BUFFER_SIZE = 1024

server_addres = ('172.16.1.52',3201)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(server_addres)
data = s.recv(BUFFER_SIZE)
s.close()

print "received data:", data

I run it using:

sudo python myProgram.py

This error appears

File "/usr/lib/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 113] No route to host

However if i run:

sudo ping 172.16.1.52

The pings work properly. I need to run ping as sudo because running it without sudo gives ping: icmp open socket: Operation not permitted

Answer 1

It ended up being a routing policy of a radio interface. It didn't allow TCP packets. The rule was set by the IT deparment and could not be changed.

I reached this conclusion after sendind TCP packets to other hosts using another interface (ie my code worked)

I made sure there was a route. I manually set the routing table for the specific IP and made sure the input policy from the remote host was set to accept TCP packets.