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ntp.packet.ControlException in ntpsweep

$ ntpsweep -m 2 -p
Host                             st offset(s) version     system       processor
--------------------------------+--+---------+-----------+------------+---------
localhost (5)                     2     0.845 0.9.6-3cc76 Linux/4.4.26 armv7l
 192.168.1.29 (9)                 1     0.005 0.9.6-4d905 Linux/4.4.13 armv7l
Traceback (most recent call last):
  File "/usr/local/bin/ntpsweep", line 174, in <module>
    scan_host(host, 0)
  File "/usr/local/bin/ntpsweep", line 124, in scan_host
    scan_host(peer, level + 1)
  File "/usr/local/bin/ntpsweep", line 124, in scan_host
    scan_host(peer, level + 1)
  File "/usr/local/bin/ntpsweep", line 52, in scan_host
    sysvars = session.readvar()
  File "/usr/local/lib/python2.7/dist-packages/ntp/packet.py", line 1160, in readvar
    self.doquery(opcode, associd=associd, qdata=qdata)
  File "/usr/local/lib/python2.7/dist-packages/ntp/packet.py", line 1096, in doquery
    raise e
ntp.packet.ControlException

best regard Dave