Trace of paramiko 1.15.2 error

error trace

[<irrelevant host>] run: ln -fs <some source> <some target>
!!! Parallel execution exception under host '<irrelevant host>':
Process <irrelevant host>:
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/tasks.py", line 239, in inner
    submit(task.run(*args, **kwargs))
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/tasks.py", line 174, in run
    return self.wrapped(*args, **kwargs)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/decorators.py", line 181, in inner
    return func(*args, **kwargs)
  File "/Users/pmourelle/code/vii-fabric/viifabric/deploy.py", line 286, in deploy_code
    self.symlink_media()
  File "/Users/pmourelle/code/vii-fabric/viifabric/deploy.py", line 331, in symlink_media
    run('ln -fs %s . ' % link)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/network.py", line 647, in host_prompting_wrapper
    return func(*args, **kwargs)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/operations.py", line 1054, in run
    shell_escape=shell_escape)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/operations.py", line 921, in _run_command
    channel=default_channel(), command=wrapped_command, pty=pty,
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/state.py", line 397, in default_channel
    chan = _open_session()
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/fabric/state.py", line 389, in _open_session
    return connections[env.host_string].get_transport().open_session()
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/paramiko/transport.py", line 615, in open_session
    max_packet_size=max_packet_size)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/paramiko/transport.py", line 724, in open_channel
    self._send_user_message(m)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/paramiko/transport.py", line 1470, in _send_user_message
    self._send_message(data)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/paramiko/transport.py", line 1450, in _send_message
    self.packetizer.send_message(data)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/paramiko/packet.py", line 318, in send_message
    self.write_all(out)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/paramiko/packet.py", line 238, in write_all
    n = self.__socket.send(out)
  File "/Users/pmourelle/.envs/viifabric/lib/python2.7/site-packages/paramiko/proxy.py", line 71, in send
    raise ProxyCommandFailure(' '.join(self.cmd), e.strerror)
ProxyCommandFailure: ('ssh -q -W <irrelevant host>:22 <irrelevant host2>', 'Broken pipe')
 
Fatal error: One or more hosts failed while executing task 'deploy_code'
 
Underlying exception:
    ('ssh -q -W <irrelevant host>:22 <irrelevant host2>', 'Broken pipe')
 
Aborting.
One or more hosts failed while executing task 'deploy_code'
 
Underlying exception:
    ('ssh -q -W <irrelevant host>:22 <irrelevant host2>', 'Broken pipe')