6

I'm trying to connect to an rabbitMQ server but the it keeps failing on connection with a socket.error: protocol not found error.

In [1]: import pika

In [2]: pika.BlockingConnection(pika.ConnectionParameters('ip_of_server'))

with error output of

---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-2-7adc44418966> in <module>()
----> 1 pika.BlockingConnection(pika.ConnectionParameters('localhost')
      2 )

/usr/lib/python2.7/dist-packages/pika/adapters/blocking_connection.pyc in __init__(self, parameters)
    105
    106         """
--> 107         super(BlockingConnection, self).__init__(parameters, None, False)
    108
    109     def add_on_close_callback(self, callback_method_unused):

/usr/lib/python2.7/dist-packages/pika/adapters/base_connection.pyc in __init__(self, parameters, on_open_callback, on_open_error_callback, on_close_callback, ioloop, stop_ioloop_on_close)
     60                                              on_open_callback,
     61                                              on_open_error_callback,
---> 62                                              on_close_callback)
     63
     64     def add_timeout(self, deadline, callback_method):

/usr/lib/python2.7/dist-packages/pika/connection.pyc in __init__(self, parameters, on_open_callback, on_open_error_callback, on_close_callback)
    588         # Initialize the connection state and connect
    589         self._init_connection_state()
--> 590         self.connect()
    591
    592     def add_backpressure_callback(self, callback_method):

/usr/lib/python2.7/dist-packages/pika/adapters/blocking_connection.pyc in connect(self)
    204         """
    205         self._set_connection_state(self.CONNECTION_INIT)
--> 206         if not self._adapter_connect():
    207             raise exceptions.AMQPConnectionError('Could not connect')
    208

/usr/lib/python2.7/dist-packages/pika/adapters/blocking_connection.pyc in _adapter_connect(self)
    272         # Remove the default behavior for connection errors
    273         self.callbacks.remove(0, self.ON_CONNECTION_ERROR)
--> 274         if not super(BlockingConnection, self)._adapter_connect():
    275             raise exceptions.AMQPConnectionError(1)
    276         self.socket.settimeout(self.SOCKET_CONNECT_TIMEOUT)

/usr/lib/python2.7/dist-packages/pika/adapters/base_connection.pyc in _adapter_connect(self)
    103         # Get the addresses for the socket, supporting IPv4 & IPv6
    104         sock_addrs = socket.getaddrinfo(self.params.host, self.params.port,
--> 105                             0, 0, socket.getprotobyname("tcp"))
    106
    107         # Iterate through each addr tuple trying to connect

error: protocol not found

I read this as it was failing on the socket.getprotobyname line in base_connection.pyc. I then tried to use socket.getprotobyname on it's own and I keep getting error: protocol not found. It obviously can't fine my TCP connection.

From what I can tell, it should output 6

In [5]: import socket

In [6]: socket.getprotobyname('tcp')
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-6-3a85adf1710a> in <module>()
----> 1 socket.getprotobyname('tcp')

error: protocol not found

I am using Ubuntu 14.04 and python 2.7.6 and I have no idea how to troubleshoot this error.

I've read some threads about the /etc/protocols file, but I do not seem to have one. Can this be the problem? If so, is there a generic file I can download or a method to create one?

1
  • Please post the code that is giving this error. Commented Oct 21, 2016 at 21:03

1 Answer 1

12

Yes, you should have a /etc/protocols file. It must have been deleted somehow. It comes from the netbase package.

This should reinstall it:

sudo apt-get -o Dpkg::Options::="--force-confmiss" install --reinstall netbase

(Further details at https://askubuntu.com/questions/66533/how-can-i-restore-configuration-files)

Sign up to request clarification or add additional context in comments.

Comments

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.