Server is throwing me an error

[somashaker goud]

Hi,

I am trying to client server program using python. Below is the code which I found online. but it's throwing me an error at s.bind((host, port))  

import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345                # Reserve a port for your service.
s.bind((host, port))        # Bind to the port

s.listen(5)                 # Now wait for client connection.
while True:
   c, addr = s.accept()     # Establish connection with client.
   print ('Got connection from', addr)
   c.send('Thank you for connecting')
   c.close()                # Close the connection
   
import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345                # Reserve a port for your service.

s.connect((host, port))
print (s.recv(1024))
s.close                     # Close the socket when done

Below is the error which I got.

Traceback (most recent call last):
 File "python", line 52, in <module>
socket.gaierror: [Errno -3] Temporary failure in name resolution

Let me know where I am doing wrong.

FYI I don't have any python set up in my local. I am practicing it online (https://repl.it )

[L Foster]

Hi, Somashaker:
I have not done much with Python or Jython (only a little).  But If I were you, I would try printing the host name provided.  Also, I would concentrate on that error message "Temporary failure in name resolution".  This sounds superficially like a DNS problem (deeper research might yield something different).  The kinds of things that can affect DNS lookups (to my own knowledge) are:

* No DNS available at all. You can check that by just pinging a well-known host that would have to be looked up by name.
* Proxy server.  Do you have a proxy you have to go through?
* /etc/hosts file.

If you are convinced this downloaded code is OK (no idea, here), then this is probably something to do with the server setup.

HTH

[Joe Ess]

I tried this code on my local machine and it appears to work fine:

Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket               # Import socket module
>>>  
... s = socket.socket()         # Create a socket object
>>> host = socket.gethostname() # Get local machine name
>>> port = 12345                # Reserve a port for your service.
>>> s.bind((host, port))        # Bind to the port
>>>  
... s.listen(5)                 # Now wait for client connection.
>>> while True:
...    c, addr = s.accept()     # Establish connection with client.
...    print ('Got connection from', addr)
...    c.send('Thank you for connecting')
...    c.close()                # Close the connection
... 


('Got connection from', ('127.0.0.1', 57898))
24

Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket               # Import socket module
>>>  
... s = socket.socket()         # Create a socket object
>>> host = socket.gethostname() # Get local machine name
>>> port = 12345                # Reserve a port for your service.
>>>  
... s.connect((host, port))
>>> print (s.recv(1024))
Thank you for connecting
>>> s.close                     # Close the socket when done
<bound method _socketobject.close of <socket._socketobject object at 0xb748ced4>>

My wild guess is that repl.it blocks server functions like binding to a socket, which makes sense to prevent malicious exploits