The following is ugly:

  File "/usr/lib/python2.7/dist-packages/paramiko/sftp_client.py", line 667, in _read_response
    raise SSHException('Server connection dropped: %s' % (str(e),))
SSHException: Server connection dropped: 
Exception OSError: OSError(32, 'Broken pipe') in <bound method SFTPFile.__del__ of <paramiko.SFTPFile object at 0x18861cd0>> ignored

There should not be a traceback, but a proper error message.

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I believe this is fixed now. --liw done