ssh: connect to host 
kdell.federez.net port 22: Network is unreachable
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/cliapp/app.py", line 190, in _run
    self.process_args(args)
  File "/usr/lib/python2.7/dist-packages/obnamlib/app.py", line 207, in
process_args
    cliapp.Application.process_args(self, args)
  File "/usr/lib/python2.7/dist-packages/cliapp/app.py", line 567, in
process_args
    method(args[1:])
  File "/usr/lib/python2.7/dist-packages/obnamlib/plugins/backup_plugin.py",
line 163, in backup
    self.start_backup()
  File "/usr/lib/python2.7/dist-packages/obnamlib/plugins/backup_plugin.py",
line 200, in start_backup
    self.repo = self.open_repository()
  File "/usr/lib/python2.7/dist-packages/obnamlib/plugins/backup_plugin.py",
line 225, in open_repository
    return self.app.get_repository_object(create=True)
  File "/usr/lib/python2.7/dist-packages/obnamlib/app.py", line 243, in
get_repository_object
    repofs.connect()
  File "/usr/lib/python2.7/dist-packages/obnamlib/plugins/sftp_plugin.py", line
199, in connect
    if not try_openssh or not self._connect_openssh():
  File "/usr/lib/python2.7/dist-packages/obnamlib/plugins/sftp_plugin.py", line
243, in _connect_openssh
    self.sftp = paramiko.SFTPClient(SSHChannelAdapter(proc))
  File "/usr/lib/python2.7/dist-packages/paramiko/sftp_client.py", line 101, in
__init__
    raise SSHException('EOF during negotiation')
SSHException: EOF during negotiation